Field Guide/Birds/Haliaeetus leucocephalus - Revision history

Jomegat: 766 revisions: re-import from WB, including edit history

2012-07-05T18:51:36Z

766 revisions: re-import from WB, including edit history

New page

{{otheruses}}

{{Taxobox
| color = neon red
| name = Bald Eagle
| status = LC
| image = Haliaeetus leucocephalus.jpg
| regnum = [[Animal]]ia
| phylum = [[Chordata]]
| classis = [[Aves]]
| ordo = [[Falconiformes]]
| familia = [[Accipitridae]]
| genus = ''[[Haliaeetus]]''
| species = '''''H. leucocephalus'''''
| binomial = ''Haliaeetus leucocephalus''
| binomial_authority = ([[Carolus Linnaeus|Linnaeus]], [[1766]])
| subdivision_ranks = [[Subspecies]]
| subdivision =
* ''H. l. leucocephalus'' {{Taxobox_authority | author = (Linnaeus | date = 1766)}} Southern Bald Eagle
* ''H. l. washingtoniensis'' {{Taxobox_authority | author = [[John James Audubon|Audubon]] | date = [[1827]])}} Northern Bald Eagle or Washington's Eagle
| synonyms =
''Falco leucocephalus'' {{Taxobox_authority | author = Linnaeus | date = 1766}} 
}}

The '''Bald Eagle''' ('''''Haliaeetus leucocephalus'''''), also known as the '''American Eagle''', is a [[bird of prey]] found in [[North America]], most recognizable as the [[national bird]] of the [[United States]].

The species was on the brink of [[extinction]] in the US late in the 20th century, but now has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].

This [[eagle]] gets both its common and scientific names from the distinctive appearance of the adult's head. ''Bald'' in the [[English language|English]] name refers to the white head feathers, and the scientific name is derived from ''Haliaeetus'', [[New Latin]] for "sea eagle," (from the [[Ancient Greek]] ''haliaetos''), and ''leucocephalus'', Latinized Ancient Greek for "white head", from ''leukos'' ("white") and ''kephale'' ("head").

==Description and systematics==
[[Image:Imm_Bald.jpg|thumb|200px|left|Underside of an immature [[Bald Eagle]] photographed while thermalling with a [[glider]] over the [[Bald Eagle Valley]] of [[Pennsylvania]] USA during the fall migration.]]

An immature Bald Eagle has speckled brown [[plumage]], the distinctive white head and body developing 2-3 years later, before sexual maturity. This species is distinguishable from the [[Golden Eagle]] in that the latter has feathers which extend down the legs. Also, the immature Bald Eagle has more light feathers in the upper arm area, especially around the 'armpit'.

Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).

The northern birds are the [[subspecies]] ''washingtoniensis'', whereas the southern ones belong to the [[nominate subspecies]] ''leucocephalus''. They are separated approximately at [[latitude]] 38° N, or roughly the latitude of [[San Francisco]]; northern birds reach a bit further south on the [[Atlantic Coast]], where they occur south to the [[Cape Hatteras]] area. Audubon's [[type specimen]] of '''"Washington's Eagle"''' - named in honor of [[George Washington]]<ref>
As explicitly stated by Audubon. However, the [[subspecific name]] he chose - ''washingtoniensis'' - means properly "from Washington (state)". There has been considerable confusion, with some authors changing it to ''washingtoni'', "(George) Washington's", but the form as originally written is correct.</ref>
- was apparently an exceptionally large bird, such as are more often found in [[Alaska]]; these have been proposed as subspecies ''alascanus'' or ''alascensis'', but the variation is [[Cline (population genetics)|clinal]] and follows [[Bergmann's Rule]].

The Bald Eagle forms a [[species pair]] with the [[Eurasia]]n [[White-tailed Eagle]]. These diverged from other Sea Eagles at the beginning of the Early [[Miocene]] (c. 10 [[mya (unit)|mya]]) at latest, possibly - if the most ancient fossil record is correctly assigned to this [[genus]] - as early as the Early/Middle [[Oligocene]], some 28 mya (Wink ''et al.'' 1996<ref>
The authors' reservations about using the generalized "2%" rate of [[molecular evolution]] have since proven to be well-founded.</ref>).
As in other sea-eagle species pairs, this one consists of a white-headed (the Bald Eagle) and a tan-headed species. They probably diverged in the North [[Pacific]], spreading westwards into Eurasia and eastwards into [[North America]]. Like the third northern species, [[Steller's Sea-eagle]], they have yellow talons, beaks and eyes in adults.

Bald Eagles are powerful fliers, and also soar on thermal convection currents.

In the wild, Bald Eagles can live about 20-30 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 60 years old.

Bald Eagles normally squeak and have a shrill cry, punctuated by grunts. They do not make the "eagle scream" as often shown on the television. What many recognize as the call of this species is actually the call of a [[Red-tailed Hawk]] dubbed into the film.

==Range, habitat, and restoration==
[[Image:bald.eagle.longshot.arp.500pix.jpg|200px|thumb|left|Adult at Combe Martin Wildlife and Dinosaur Park, North Devon, England]]
The Bald Eagle's natural range covers most of North America, including most of [[Canada]], all of the continental United States, and northern [[Mexico]]. The bird itself is able to live in most of North America's varied habitats from the [[bayou]]s of [[Louisiana]] to the [[Sonoran Desert|Sonoran desert]] and the eastern deciduous forests of [[Quebec]] and [[New England]]. It can be a [[bird migration|migratory]] bird but it also is not unheard of for a nesting pair to overwinter in its breeding area.

Once a common sight in much of the continent, the Bald Eagle was severely affected by the use of the pesticide [[DDT]] in the mid-twentieth century. While the pesticide itself was not lethal to the bird, it made an eagle either sterile or unable to lay healthy eggs: the eagle would ingest the chemical through its food and then lay eggs that were too brittle to withstand the weight of a brooding adult. By the 1960s there were fewer than 500 nesting pairs in the 48 [[Contiguous United States|contiguous states]] of the USA.

Currently it is still slowly but steadily recovering its numbers; Organizations like the [[Fraternal Order of Eagles]] which carry the Eagle as their emblem, have helped the American Bald Eagle on its recovery, by supporting other groups that rescue and preserve the Eagles and their habitat. The Bald Eagle can be found in growing concentrations throughout the United States and [[Canada]], particularly near large [[body of water|bodies of water]]. The [[U.S. state]] with the largest resident population is [[Alaska]]; out of the estimated 70,000 Bald Eagles on [[Earth]], half live there.

Permits are required to keep this species in captivity (e-CFR 1974). As a rule, the Bald Eagle is a poor choice for public shows, being timid, prone to becoming highly stressed, and unpredictable in nature. As remarked above, they can be long-lived in captivity in key demands are met, but do not breed well even under the best conditions. The only Bald Eagle to be born outside North America hatched on [[May 3]], [[2006]] in [[Magdeburg]] Zoo, [[Germany]].

This species has occurred as a [[Vagrancy (biology)|vagrant]] once in [[Ireland]]. The exhausted specimen was discovered by a [[national park]]s worker in a northern [[heath]]. Presumably, a storm blew it out to sea, and the bird struggled across the [[Atlantic Ocean]].

==Reproduction==
[[Image:Haliaeetus leucocephalus1.jpg|thumb|right|Two bald eagle chicks]]
Bald Eagles build huge nests out of branches, usually in large trees near water. The nest may stretch as large as eight feet across and weigh up to a ton (907kg). When breeding where there are no trees, the Bald Eagle will nest on the ground.

Eagles that are old enough to breed often return to the area where they were born. An adult looking for a site is likely to select a spot that contains other breeding Bald Eagles.

Bald Eagles are sexually mature at 4 or 5 years old. Eagles produce between one and three eggs per year, but it is rare for all three chicks to successfully fly. Both the male and female take turns sitting on the eggs. The other parent will hunt for food or look for nest material.

==Diet==
The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well.

To hunt fish, easily their most important live prey, the eagle swoops down over the water and snatches the fish out of the water with its [[talons]]. They eat by holding the fish in one claw and tearing the flesh with the other. Eagles have structures on their toes called [[spiricules]] that allow them to grasp fish. [[Osprey]] also have this adaptation. Bald Eagles have powerful talons. In one case, an eagle was able to fly off with the 6.8 kg (15 lb) carcass of a [[Mule Deer]] fawn.

Sometimes, if the fish is too heavy to lift, the eagle will be dragged into the water. It may swim to safety, but some eagles drown or succumb to [[hypothermia]]. Occasionally, Bald Eagles will pirate fish away from [[Osprey]]s and usually the smaller raptors will have to give up their prey, a practice known as [[kleptoparasitism]].

==National bird of the U.S.==
[[Image:Bald eagle.jpg|thumb|right|250px|Bald Eagle portrait]]
The Bald Eagle is the national bird of the [[United States]] of America. It is probably one of the country's most recognizable symbols, and appears on most of its official seals, including the [[Seal of the President of the United States]].

Its national significance dates back to [[June 20]], [[1782]], when the [[Continental Congress]] officially adopted the current design for the [[Great Seal of the United States]] including a Bald Eagle grasping arrows and an olive branch with its [[talons]]. Some states had earlier did so in 1778.

In 1784, after the end of the [[Revolutionary War]], [[Benjamin Franklin]] wrote a famous letter to his daughter from [[Paris]] criticizing the choice and suggesting the [[Wild Turkey]]'s character as a desirable trait:

<blockquote>''For my own part I wish the Bald Eagle had not been chosen the Representative of our Country. He is a Bird of bad moral character. He does not get his Living honestly. You may have seen him perched on some dead Tree near the River, where, too lazy to fish for himself, he watches the Labour of the Fishing Hawk; and when that diligent Bird has at length taken a Fish, and is bearing it to his Nest for the Support of his Mate and young Ones, the Bald Eagle pursues him and takes it from him.</blockquote>

<blockquote>''With all this Injustice, he is never in good Case but like those among Men who live by Sharping & Robbing he is generally poor and often very lousy. Besides he is a rank Coward: The little [[kingbird|King Bird]] not bigger than a Sparrow attacks him boldly and drives him out of the District. He is therefore by no means a proper Emblem for the brave and honest country of America who have driven all the King birds from our Country...</blockquote>

<blockquote>''I am on this account not displeased that the Figure is not known as a Bald Eagle, but looks more like a Turkey. For the Truth the Turkey is in Comparison a much more respectable Bird, and withal a true original Native of America . . . He is besides, though a little vain & silly, a Bird of Courage, and would not hesitate to attack a Grenadier of the British Guards who should presume to invade his Farm Yard with a red Coat on.''</blockquote>

Despite Franklin's objections, the Bald Eagle remained the emblem of the United States. It can be found on both national seals and on the back of several coins (including the [[Quarter (U.S. coin)|quarter]] dollar coin until 1999), with its head oriented towards the olive branch. Between [[1916]] and [[1945]], the [[Presidential Flag]] showed an eagle facing to its left (the viewer's right), which gave rise to the [[urban legend]] that the seal is changed to have the eagle face towards the olive branch in peace, and towards the arrows in wartime.<ref>{{cite web |url=http://www.snopes.com/history/american/turnhead.htm |title=http://www.snopes.com/history/american/turnhead.htm |accessdate= |format= |work= }}</ref>

[[Image:BaldeagleYSNP.JPG|thumb|right|250px|Bald Eagle at Yellowstone National Park]]

== Bald Eagles as religious objects ==
The Bald Eagle is a sacred bird in some North American cultures and its feathers, like those of the [[Golden Eagle]], are central to many [[religious]] and [[spiritual]] customs amongst [[Indigenous peoples of the Americas|Native Americans]]. Some Native Americans revere eagles as sacred religious objects, including the feathers and other parts and are often compared to the [[Bible]] and [[crucifix]] (AP 2004).

Eagle feathers are often used in traditional ceremonies and are used to honor noteworthy achievements and qualities such as exceptional leadership and bravery.

Despite modern and historic Native American practices of giving eagle feathers to non-Native Americans and Native American members of other tribes who have been deemed worthy, current [[eagle feather law]] stipulates that only individuals of certifiable Native American ancestry enrolled in a federally recognized tribe are legally authorized to obtain Bald or Golden Eagle feathers for [[religious]] or [[spiritual]] use (AP 2002) Attempts to extend this permitted use have met with resistance from members of federally recognized Native American tribes, who even under the permissive legislation sometimes have to wait for years before a good specimen can be procured for their use (AP 2004).

==References==
* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30.

* '''Associated Press''' (AP) (2004): ''[http://www.wwrn.org/article.php?idd=4949&sec=73&cont=6 Residents fight to use eagle feathers]''. Retrieved 2006-NOV-30.

* {{IUCN2006|assessors='''BirdLife International'''|year=2004|id=49336|title=Haliaeetus leucocephalus|downloaded=09 May 2006}} Database entry includes justification for why this species is of least concern

* '''Boradiansky''', Tina S. (1990): ''[http://www.animallaw.info/articles/arus30nrj709.htm Conflicting Values: The Religious Killing of Federally Protected Wildlife]''. Retrieved 2006-NOV-30.

* '''DeMeo''', Antonia M. (1995): Access to Eagles and Eagle Parts: Environmental Protection v. Native American Free Exercise of Religion. ''Hastings Constitutional Law Quarterly'' '''22'''(3): 771-813. [http://www.animallaw.info/articles/ar22hstclq771.htm HTML fulltext]

* '''Electronic Code of Federal Regulations''' (e-CFR) (1974): ''Title 50: Wildlife and Fisheries. Part 22 - Eagle Permits''. [http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=8f792182cc6e2d5c11136fe0db280d2b&rgn=div5&view=text&node=50:6.0.1.1.5&idno=50 HTML fulltext]

* '''Wink''', M.; Heidrich, P. & Fentzloff, C. (1996): A mtDNA phylogeny of sea eagles (genus ''Haliaeetus'') based on nucleotide sequences of the cytochrome ''b'' gene. ''Biochemical Systematics and Ecology'' '''24''': 783-791. {{DOI|10.1016/S0305-1978(96)00049-X}} [http://www.uni-heidelberg.de/institute/fak14/ipmb/phazb/pubwink/1996/20_1996.pdf PDF fulltext]

===Footnotes===
<references/>

==External links==
{{commons|Haliaeetus leucocephalus}}
*[http://www.baldeagleinfo.com/ Bald Eagle Info.com]. Retrieved 2006-NOV-30.
*BirdHouses101.com: [http://www.birdhouses101.com/bald-eagle.asp Bald Eagle]. Retrieved 2006-NOV-30.
*[http://www.eraptors.org/index.html Cascades Raptor Center]. Retrieved 2006-NOV-30.
*GreatSeal.com: [http://www.greatseal.com/symbols/turkey.html The Eagle, Ben Franklin, and the Turkey]. Retrieved 2006-NOV-30.
*NE Energy: [http://www.nu.com/eagles/default.asp Barton Island, Massachusetts, Bald Eagle webcam]. Retrieved 2006-NOV-30.
*[[USFWS]]: [http://images.fws.gov/default.cfm?fuseaction=records.display&CFID=2060719&CFTOKEN=64720564&id=5C7D1A7F%2DF41E%2D4C0A%2D87A4F0A6E628BD0E 1.24 MB Bald Eagle JPEG]. Retrieved 2006-NOV-30.



[[Category:Avifauna of Canada]]
[[Category:Avifauna of Southeastern United States]]
[[Category:Avifauna of the United States]]
[[Category:Eagles]]
[[Category:Haliaeetus]]
[[Category:Fauna of Minnesota|Eagle, bald]]

[[be:Белагаловы арол]]
[[cs:Orel bělohlavý]]
[[da:Hvidhovedet havørn]]
[[de:Weißkopfseeadler]]
[[es:Pigargo cabeciblanco]]
[[eo:Blankkapa maraglo]]
[[fr:Pygargue à tête blanche]]
[[it:Haliaeetus leucocephalus]]
[[he:עיטם לבן ראש]]
[[nl:Amerikaanse zeearend]]
[[cr:ᒥᒋᓲ]]
[[ja:ハクトウワシ]]
[[pl:Bielik amerykański]]
[[pt:Águia de cabeça branca]]
[[sk:Orliak bielohlavý]]
[[fi:Valkopäämerikotka]]
[[sv:Vithövdad havsörn]]
[[ta:வெண்தலைக் கழுகு]]

65.30.119.82: /* Description and systematics */

2006-12-13T23:05:43Z

Description and systematics

New page

{{otheruses}}

{{Taxobox
| color = neon red
| name = Bald Eagle
| status = LC
| image = Haliaeetus leucocephalus.jpg
| regnum = [[Animal]]ia
| phylum = [[Chordata]]
| classis = [[Aves]]
| ordo = [[Falconiformes]]
| familia = [[Accipitridae]]
| genus = ''[[Haliaeetus]]''
| species = '''''H. leucocephalus'''''
| binomial = ''Haliaeetus leucocephalus''
| binomial_authority = ([[Carolus Linnaeus|Linnaeus]], [[1766]])
| subdivision_ranks = [[Subspecies]]
| subdivision =
* ''H. l. leucocephalus'' {{Taxobox_authority | author = (Linnaeus | date = 1766)}} Southern Bald Eagle
* ''H. l. washingtoniensis'' {{Taxobox_authority | author = [[John James Audubon|Audubon]] | date = [[1827]])}} Northern Bald Eagle or Washington's Eagle
| synonyms =
''Falco leucocephalus'' {{Taxobox_authority | author = Linnaeus | date = 1766}} 
}}

The '''Bald Eagle''' ('''''Haliaeetus leucocephalus'''''), also known as the '''American Eagle''', is a [[bird of prey]] found in [[North America]], most recognizable as the [[national bird]] of the [[United States]].

The species was on the brink of [[extinction]] in the US late in the 20th century, but now has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].

This [[eagle]] gets both its common and scientific names from the distinctive appearance of the adult's head. ''Bald'' in the [[English language|English]] name refers to the white head feathers, and the scientific name is derived from ''Haliaeetus'', [[New Latin]] for "sea eagle," (from the [[Ancient Greek]] ''haliaetos''), and ''leucocephalus'', Latinized Ancient Greek for "white head", from ''leukos'' ("white") and ''kephale'' ("head").

==Description and systematics==
[[Image:Imm_Bald.jpg|thumb|200px|left|An immature [[Bald Eagle]] photographed while thermalling with a [[glider]] over the [[Bald Eagle Valley]] of [[Pennsylvania]] USA. ]]

An immature Bald Eagle has speckled brown [[plumage]], the distinctive white head and body developing 2-3 years later, before sexual maturity. This species is distinguishable from the [[Golden Eagle]] in that the latter has feathers which extend down the legs.

Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).

The northern birds are the [[subspecies]] ''washingtoniensis'', whereas the southern ones belong to the [[nominate subspecies]] ''leucocephalus''. They are separated approximately at [[latitude]] 38° N, or roughly the latitude of [[San Francisco]]; northern birds reach a bit further south on the [[Atlantic Coast]], where they occur south to the [[Cape Hatteras]] area. Audubon's [[type specimen]] of '''"Washington's Eagle"''' - named in honor of [[George Washington]]<ref>
As explicitly stated by Audubon. However, the [[subspecific name]] he chose - ''washingtoniensis'' - means properly "from Washington (state)". There has been considerable confusion, with some authors changing it to ''washingtoni'', "(George) Washington's", but the form as originally written is correct.</ref>
- was apparently an exceptionally large bird, such as are more often found in [[Alaska]]; these have been proposed as subspecies ''alascanus'' or ''alascensis'', but the variation is [[Cline (population genetics)|clinal]] and follows [[Bergmann's Rule]].

The Bald Eagle forms a [[species pair]] with the [[Eurasia]]n [[White-tailed Eagle]]. These diverged from other Sea Eagles at the beginning of the Early [[Miocene]] (c. 10 [[mya (unit)|mya]]) at latest, possibly - if the most ancient fossil record is correctly assigned to this [[genus]] - as early as the Early/Middle [[Oligocene]], some 28 mya (Wink ''et al.'' 1996<ref>
The authors' reservations about using the generalized "2%" rate of [[molecular evolution]] have since proven to be well-founded.</ref>).
As in other sea-eagle species pairs, this one consists of a white-headed (the Bald Eagle) and a tan-headed species. They probably diverged in the North [[Pacific]], spreading westwards into Eurasia and eastwards into [[North America]]. Like the third northern species, [[Steller's Sea-eagle]], they have yellow talons, beaks and eyes in adults.

Bald Eagles are powerful fliers, and also soar on thermal convection currents.

In the wild, Bald Eagles can live about 20-30 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 95 years old.

Bald Eagles normally squeak and have a shrill cry, punctuated by grunts. They do not make the "eagle scream" as often shown on the television. What many recognize as the call of this species is actually the call of a [[Red-tailed Hawk]] dubbed into the film.

==Range, habitat, and restoration==
[[Image:bald.eagle.longshot.arp.500pix.jpg|200px|thumb|left|Adult at Combe Martin Wildlife and Dinosaur Park, North Devon, England]]
The Bald Eagle's natural range covers most of North America, including most of [[Canada]], all of the continental United States, and northern [[Mexico]]. The bird itself is able to live in most of North America's varied habitats from the [[bayou]]s of [[Louisiana]] to the [[Sonoran Desert|Sonoran desert]] and the eastern deciduous forests of [[Quebec]] and [[New England]]. It can be a [[bird migration|migratory]] bird but it also is not unheard of for a nesting pair to overwinter in its breeding area.

Once a common sight in much of the continent, the Bald Eagle was severely affected by the use of the pesticide [[DDT]] in the mid-twentieth century. While the pesticide itself was not lethal to the bird, it made an eagle either sterile or unable to lay healthy eggs: the eagle would ingest the chemical through its food and then lay eggs that were too brittle to withstand the weight of a brooding adult. By the 1960s there were fewer than 500 nesting pairs in the 48 [[Contiguous United States|contiguous states]] of the USA.

Currently it is still slowly but steadily recovering its numbers; Organizations like the [[Fraternal Order of Eagles]] which carry the Eagle as their emblem, have helped the American Bald Eagle on its recovery, by supporting other groups that rescue and preserve the Eagles and their habitat. The Bald Eagle can be found in growing concentrations throughout the United States and [[Canada]], particularly near large [[body of water|bodies of water]]. The [[U.S. state]] with the largest resident population is [[Alaska]]; out of the estimated 70,000 Bald Eagles on [[Earth]], half live there.

Permits are required to keep this species in captivity (e-CFR 1974). As a rule, the Bald Eagle is a poor choice for public shows, being timid, prone to becoming highly stressed, and unpredictable in nature. As remarked above, they can be long-lived in captivity in key demands are met, but do not breed well even under the best conditions. The only Bald Eagle to be born outside North America hatched on [[May 3]], [[2006]] in [[Magdeburg]] Zoo, [[Germany]].

This species has occurred as a [[Vagrancy (biology)|vagrant]] once in [[Ireland]]. The exhausted specimen was discovered by a [[national park]]s worker in a northern [[heath]]. Presumably, a storm blew it out to sea, and the bird struggled across the [[Atlantic Ocean]].

==Reproduction==
[[Image:Haliaeetus leucocephalus1.jpg|thumb|right|Two bald eagle chicks]]
Bald Eagles build huge nests out of branches, usually in large trees near water. The nest may stretch as large as eight feet across and weigh up to a ton (907kg). When breeding where there are no trees, the Bald Eagle will nest on the ground.

Eagles that are old enough to breed often return to the area where they were born. An adult looking for a site is likely to select a spot that contains other breeding Bald Eagles.

Bald Eagles are sexually mature at 4 or 5 years old. Eagles produce between one and three eggs per year, but it is rare for all three chicks to successfully fly. Both the male and female take turns sitting on the eggs. The other parent will hunt for food or look for nest material.

==Diet==
The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well.

To hunt fish, easily their most important live prey, the eagle swoops down over the water and snatches the fish out of the water with its [[talons]]. They eat by holding the fish in one claw and tearing the flesh with the other. Eagles have structures on their toes called [[spiricules]] that allow them to grasp fish. [[Osprey]] also have this adaptation. Bald Eagles have powerful talons. In one case, an eagle was able to fly off with the 6.8 kg (15 lb) carcass of a [[Mule Deer]] fawn.

Sometimes, if the fish is too heavy to lift, the eagle will be dragged into the water. It may swim to safety, but some eagles drown or succumb to [[hypothermia]]. Occasionally, Bald Eagles will pirate fish away from [[Osprey]]s and usually the smaller raptors will have to give up their prey, a practice known as [[kleptoparasitism]].

==National bird of the U.S.==
[[Image:Bald eagle.jpg|thumb|right|250px|Bald Eagle portrait]]
The Bald Eagle is the national bird of the [[United States]] of America. It is probably one of the country's most recognizable symbols, and appears on most of its official seals, including the [[Seal of the President of the United States]].

Its national significance dates back to [[June 20]], [[1782]], when the [[Continental Congress]] officially adopted the current design for the [[Great Seal of the United States]] including a Bald Eagle grasping arrows and an olive branch with its [[talons]]. Some states had earlier ad,kklkokiid so in 1778.

In 1784, after the end of the [[Revolutionary War]], [[Benjamin Franklin]] wrote a famous letter to his daughter from [[Paris]] criticizing the choice and suggesting the [[Wild Turkey]]'s character as a desirable trait:

<blockquote>''For my own part I wish the Bald Eagle had not been chosen the Representative of our Country. He is a Bird of bad moral character. He does not get his Living honestly. You may have seen him perched on some dead Tree near the River, where, too lazy to fish for himself, he watches the Labour of the Fishing Hawk; and when that diligent Bird has at length taken a Fish, and is bearing it to his Nest for the Support of his Mate and young Ones, the Bald Eagle pursues him and takes it from him.</blockquote>

<blockquote>''With all this Injustice, he is never in good Case but like those among Men who live by Sharping & Robbing he is generally poor and often very lousy. Besides he is a rank Coward: The little [[kingbird|King Bird]] not bigger than a Sparrow attacks him boldly and drives him out of the District. He is therefore by no means a proper Emblem for the brave and honest country of America who have driven all the King birds from our Country...</blockquote>

<blockquote>''I am on this account not displeased that the Figure is not known as a Bald Eagle, but looks more like a Turkey. For the Truth the Turkey is in Comparison a much more respectable Bird, and withal a true original Native of America . . . He is besides, though a little vain & silly, a Bird of Courage, and would not hesitate to attack a Grenadier of the British Guards who should presume to invade his Farm Yard with a red Coat on.''</blockquote>

Despite Franklin's objections, the Bald Eagle remained the emblem of the United States. It can be found on both national seals and on the back of several coins (including the [[Quarter (U.S. coin)|quarter]] dollar coin until 1999), with its head oriented towards the olive branch. Between [[1916]] and [[1945]], the [[Presidential Flag]] showed an eagle facing to its left (the viewer's right), which gave rise to the [[urban legend]] that the seal is changed to have the eagle face towards the olive branch in peace, and towards the arrows in wartime.<ref>{{cite web |url=http://www.snopes.com/history/american/turnhead.htm |title=http://www.snopes.com/history/american/turnhead.htm |accessdate= |format= |work= }}</ref>

[[Image:BaldeagleYSNP.JPG|thumb|right|250px|Bald Eagle at Yellowstone National Park]]
<nowiki>Insert non-formatted text here</nowiki>

== Bald Eagles as religious objects ==
The Bald Eagle is a sacred bird in some North American cultures and its feathers, like those of the [[Golden Eagle]], are central to many [[religious]] and [[spiritual]] customs amongst [[Indigenous peoples of the Americas|Native Americans]]. Some Native Americans revere eagles as sacred religious objects, including the feathers and other parts and are often compared to the [[Bible]] and [[crucifix]] (AP 2004).

Eagle feathers are often used in traditional ceremonies and are used to honor noteworthy achievements and qualities such as exceptional leadership and bravery.

Despite modern and historic Native American practices of giving eagle feathers to non-Native Americans and Native American members of other tribes who have been deemed worthy, current [[eagle feather law]] stipulates that only individuals of certifiable Native American ancestry enrolled in a federally recognized tribe are legally authorized to obtain Bald or Golden Eagle feathers for [[religious]] or [[spiritual]] use (AP 2002) Attempts to extend this permitted use have met with resistance from members of federally recognized Native American tribes, who even under the permissive legislation sometimes have to wait for years before a good specimen can be procured for their use (AP 2004).

==References==
* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30.

* '''Associated Press''' (AP) (2004): ''[http://www.wwrn.org/article.php?idd=4949&sec=73&cont=6 Residents fight to use eagle feathers]''. Retrieved 2006-NOV-30.

* {{IUCN2006|assessors='''BirdLife International'''|year=2004|id=49336|title=Haliaeetus leucocephalus|downloaded=09 May 2006}} Database entry includes justification for why this species is of least concern

* '''Boradiansky''', Tina S. (1990): ''[http://www.animallaw.info/articles/arus30nrj709.htm Conflicting Values: The Religious Killing of Federally Protected Wildlife]''. Retrieved 2006-NOV-30.

* '''DeMeo''', Antonia M. (1995): Access to Eagles and Eagle Parts: Environmental Protection v. Native American Free Exercise of Religion. ''Hastings Constitutional Law Quarterly'' '''22'''(3): 771-813. [http://www.animallaw.info/articles/ar22hstclq771.htm HTML fulltext]

* '''Electronic Code of Federal Regulations''' (e-CFR) (1974): ''Title 50: Wildlife and Fisheries. Part 22 - Eagle Permits''. [http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=8f792182cc6e2d5c11136fe0db280d2b&rgn=div5&view=text&node=50:6.0.1.1.5&idno=50 HTML fulltext]

* '''Wink''', M.; Heidrich, P. & Fentzloff, C. (1996): A mtDNA phylogeny of sea eagles (genus ''Haliaeetus'') based on nucleotide sequences of the cytochrome ''b'' gene. ''Biochemical Systematics and Ecology'' '''24''': 783-791. {{DOI|10.1016/S0305-1978(96)00049-X}} [http://www.uni-heidelberg.de/institute/fak14/ipmb/phazb/pubwink/1996/20_1996.pdf PDF fulltext]

===Footnotes===
<references/>

==External links==
{{commons|Haliaeetus leucocephalus}}
*[http://www.baldeagleinfo.com/ Bald Eagle Info.com]. Retrieved 2006-NOV-30.
*BirdHouses101.com: [http://www.birdhouses101.com/bald-eagle.asp Bald Eagle]. Retrieved 2006-NOV-30.
*[http://www.eraptors.org/index.html Cascades Raptor Center]. Retrieved 2006-NOV-30.
*GreatSeal.com: [http://www.greatseal.com/symbols/turkey.html The Eagle, Ben Franklin, and the Turkey]. Retrieved 2006-NOV-30.
*NE Energy: [http://www.nu.com/eagles/default.asp Barton Island, Massachusetts, Bald Eagle webcam]. Retrieved 2006-NOV-30.
*[[USFWS]]: [http://images.fws.gov/default.cfm?fuseaction=records.display&CFID=2060719&CFTOKEN=64720564&id=5C7D1A7F%2DF41E%2D4C0A%2D87A4F0A6E628BD0E 1.24 MB Bald Eagle JPEG]. Retrieved 2006-NOV-30.



[[Category:Avifauna of Canada]]
[[Category:Avifauna of Southeastern United States]]
[[Category:Avifauna of the United States]]
[[Category:Eagles]]
[[Category:Haliaeetus]]
[[Category:Fauna of Minnesota|Eagle, bald]]

[[be:Белагаловы арол]]
[[cs:Orel bělohlavý]]
[[da:Hvidhovedet havørn]]
[[de:Weißkopfseeadler]]
[[es:Pigargo cabeciblanco]]
[[eo:Blankkapa maraglo]]
[[fr:Pygargue à tête blanche]]
[[it:Haliaeetus leucocephalus]]
[[he:עיטם לבן ראש]]
[[nl:Amerikaanse zeearend]]
[[cr:ᒥᒋᓲ]]
[[ja:ハクトウワシ]]
[[pl:Bielik amerykański]]
[[pt:Águia de cabeça branca]]
[[sk:Orliak bielohlavý]]
[[fi:Valkopäämerikotka]]
[[sv:Vithövdad havsörn]]
[[ta:வெண்தலைக் கழுகு]]

141.150.69.8: /* Description and systematics */

2006-12-13T19:00:18Z

Description and systematics

New page

{{otheruses}}

{{Taxobox
| color = neon red
| name = Bald Eagle
| status = LC
| image = Haliaeetus leucocephalus.jpg
| regnum = [[Animal]]ia
| phylum = [[Chordata]]
| classis = [[Aves]]
| ordo = [[Falconiformes]]
| familia = [[Accipitridae]]
| genus = ''[[Haliaeetus]]''
| species = '''''H. leucocephalus'''''
| binomial = ''Haliaeetus leucocephalus''
| binomial_authority = ([[Carolus Linnaeus|Linnaeus]], [[1766]])
| subdivision_ranks = [[Subspecies]]
| subdivision =
* ''H. l. leucocephalus'' {{Taxobox_authority | author = (Linnaeus | date = 1766)}} Southern Bald Eagle
* ''H. l. washingtoniensis'' {{Taxobox_authority | author = [[John James Audubon|Audubon]] | date = [[1827]])}} Northern Bald Eagle or Washington's Eagle
| synonyms =
''Falco leucocephalus'' {{Taxobox_authority | author = Linnaeus | date = 1766}} 
}}

The '''Bald Eagle''' ('''''Haliaeetus leucocephalus'''''), also known as the '''American Eagle''', is a [[bird of prey]] found in [[North America]], most recognizable as the [[national bird]] of the [[United States]].

The species is on the brink of [[extinction]] since the USA's late in the 20th century, but now has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].

This [[eagle]] gets both its common and scientific names from the distinctive appearance of the adult's head. ''Bald'' in the [[English language|English]] name refers to the white head feathers, and the scientific name is derived from ''Haliaeetus'', [[New Latin]] for "sea eagle," (from the [[Ancient Greek]] ''haliaetos''), and ''leucocephalus'', Latinized Ancient Greek for "white head", from ''leukos'' ("white") and ''kephale'' ("head").

==Description and systematics==
America's secondary animal is widely considered as the bision.

An immature Bald Eagle has speckled brown [[plumage]], the distinctive white head and body developing 2-3 years later, before sexual maturity. This species is distinguishable from the [[Golden Eagle]] in that the latter has feathers which extend down the legs.

Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).

The northern birds are the [[subspecies]] ''washingtoniensis'', whereas the southern ones belong to the [[nominate subspecies]] ''leucocephalus''. They are separated approximately at [[latitude]] 38° N, or roughly the latitude of [[San Francisco]]; northern birds reach a bit further south on the [[Atlantic Coast]], where they occur south to the [[Cape Hatteras]] area. Audubon's [[type specimen]] of '''"Washington's Eagle"''' - named in honor of [[George Washington]]<ref>
As explicitly stated by Audubon. However, the [[subspecific name]] he chose - ''washingtoniensis'' - means properly "from Washington (state)". There has been considerable confusion, with some authors changing it to ''washingtoni'', "(George) Washington's", but the form as originally written is correct.</ref>
- was apparently an exceptionally large bird, such as are more often found in [[Alaska]]; these have been proposed as subspecies ''alascanus'' or ''alascensis'', but the variation is [[Cline (population genetics)|clinal]] and follows [[Bergmann's Rule]].

The Bald Eagle forms a [[species pair]] with the [[Eurasia]]n [[White-tailed Eagle]]. These diverged from other Sea Eagles at the beginning of the Early [[Miocene]] (c. 10 [[mya (unit)|mya]]) at latest, possibly - if the most ancient fossil record is correctly assigned to this [[genus]] - as early as the Early/Middle [[Oligocene]], some 28 mya (Wink ''et al.'' 1996<ref>
The authors' reservations about using the generalized "2%" rate of [[molecular evolution]] have since proven to be well-founded.</ref>).
As in other sea-eagle species pairs, this one consists of a white-headed (the Bald Eagle) and a tan-headed species. They probably diverged in the North [[Pacific]], spreading westwards into Eurasia and eastwards into [[North America]]. Like the third northern species, [[Steller's Sea-eagle]], they have yellow talons, beaks and eyes in adults.

Bald Eagles are powerful fliers, and also soar on thermal convection currents.

In the wild, Bald Eagles can live about 20-30 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 60 years old.

Bald Eagles normally squeak and have a shrill cry, punctuated by grunts. They do not make the "eagle scream" as often shown on the television. What many recognize as the call of this species is actually the call of a [[Red-tailed Hawk]] dubbed into the film.

==Range, habitat, and restoration==
[[Image:bald.eagle.longshot.arp.500pix.jpg|200px|thumb|left|Adult at Combe Martin Wildlife and Dinosaur Park, North Devon, England]]
The Bald Eagle's natural range covers most of North America, including most of [[Canada]], all of the continental United States, and northern [[Mexico]]. The bird itself is able to live in most of North America's varied habitats from the [[bayou]]s of [[Louisiana]] to the [[Sonoran Desert|Sonoran desert]] and the eastern deciduous forests of [[Quebec]] and [[New England]]. It can be a [[bird migration|migratory]] bird but it also is not unheard of for a nesting pair to overwinter in its breeding area.

Once a common sight in much of the continent, the Bald Eagle was severely affected by the use of the pesticide [[DDT]] in the mid-twentieth century. While the pesticide itself was not lethal to the bird, it made an eagle either sterile or unable to lay healthy eggs: the eagle would ingest the chemical through its food and then lay eggs that were too brittle to withstand the weight of a brooding adult. By the 1960s there were fewer than 500 nesting pairs in the 48 [[Contiguous United States|contiguous states]] of the USA.

Currently it is still slowly but steadily recovering its numbers; Organizations like the [[Fraternal Order of Eagles]] which carry the Eagle as their emblem, have helped the American Bald Eagle on its recovery, by supporting other groups that rescue and preserve the Eagles and their habitat. The Bald Eagle can be found in growing concentrations throughout the United States and [[Canada]], particularly near large [[body of water|bodies of water]]. The [[U.S. state]] with the largest resident population is [[Alaska]]; out of the estimated 70,000 Bald Eagles on [[Earth]], half live there.

Permits are required to keep this species in captivity (e-CFR 1974). As a rule, the Bald Eagle is a poor choice for public shows, being timid, prone to becoming highly stressed, and unpredictable in nature. As remarked above, they can be long-lived in captivity in key demands are met, but do not breed well even under the best conditions. The only Bald Eagle to be born outside North America hatched on [[May 3]], [[2006]] in [[Magdeburg]] Zoo, [[Germany]].

This species has occurred as a [[Vagrancy (biology)|vagrant]] once in [[Ireland]]. The exhausted specimen was discovered by a [[national park]]s worker in a northern [[heath]]. Presumably, a storm blew it out to sea, and the bird struggled across the [[Atlantic Ocean]].

==Reproduction==
[[Image:Haliaeetus leucocephalus1.jpg|thumb|right|Two bald eagle chicks]]
Bald Eagles build huge nests out of branches, usually in large trees near water. The nest may stretch as large as eight feet across and weigh up to a ton (907kg). When breeding where there are no trees, the Bald Eagle will nest on the ground.

Eagles that are old enough to breed often return to the area where they were born. An adult looking for a site is likely to select a spot that contains other breeding Bald Eagles.

Bald Eagles are sexually mature at 4 or 5 years old. Eagles produce between one and three eggs per year, but it is rare for all three chicks to successfully fly. Both the male and female take turns sitting on the eggs. The other parent will hunt for food or look for nest material.

==Diet==
The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well.

To hunt fish, easily their most important live prey, the eagle swoops down over the water and snatches the fish out of the water with its [[talons]]. They eat by holding the fish in one claw and tearing the flesh with the other. Eagles have structures on their toes called [[spiricules]] that allow them to grasp fish. [[Osprey]] also have this adaptation. Bald Eagles have powerful talons. In one case, an eagle was able to fly off with the 6.8 kg (15 lb) carcass of a [[Mule Deer]] fawn.

Sometimes, if the fish is too heavy to lift, the eagle will be dragged into the water. It may swim to safety, but some eagles drown or succumb to [[hypothermia]]. Occasionally, Bald Eagles will pirate fish away from [[Osprey]]s and usually the smaller raptors will have to give up their prey, a practice known as [[kleptoparasitism]].

==National bird of the U.S.==
[[Image:Bald eagle.jpg|thumb|right|250px|Bald Eagle portrait]]
The Bald Eagle is the national bird of the [[United States]] of America. It is probably one of the country's most recognizable symbols, and appears on most of its official seals, including the [[Seal of the President of the United States]].

Its national significance dates back to [[June 20]], [[1782]], when the [[Continental Congress]] officially adopted the current design for the [[Great Seal of the United States]] including a Bald Eagle grasping arrows and an olive branch with its [[talons]]. Some states had earlier ad,kklkokiid so in 1778.

In 1784, after the end of the [[Revolutionary War]], [[Benjamin Franklin]] wrote a famous letter to his daughter from [[Paris]] criticizing the choice and suggesting the [[Wild Turkey]]'s character as a desirable trait:

<blockquote>''For my own part I wish the Bald Eagle had not been chosen the Representative of our Country. He is a Bird of bad moral character. He does not get his Living honestly. You may have seen him perched on some dead Tree near the River, where, too lazy to fish for himself, he watches the Labour of the Fishing Hawk; and when that diligent Bird has at length taken a Fish, and is bearing it to his Nest for the Support of his Mate and young Ones, the Bald Eagle pursues him and takes it from him.</blockquote>

<blockquote>''With all this Injustice, he is never in good Case but like those among Men who live by Sharping & Robbing he is generally poor and often very lousy. Besides he is a rank Coward: The little [[kingbird|King Bird]] not bigger than a Sparrow attacks him boldly and drives him out of the District. He is therefore by no means a proper Emblem for the brave and honest country of America who have driven all the King birds from our Country...</blockquote>

<blockquote>''I am on this account not displeased that the Figure is not known as a Bald Eagle, but looks more like a Turkey. For the Truth the Turkey is in Comparison a much more respectable Bird, and withal a true original Native of America . . . He is besides, though a little vain & silly, a Bird of Courage, and would not hesitate to attack a Grenadier of the British Guards who should presume to invade his Farm Yard with a red Coat on.''</blockquote>

Despite Franklin's objections, the Bald Eagle remained the emblem of the United States. It can be found on both national seals and on the back of several coins (including the [[Quarter (U.S. coin)|quarter]] dollar coin until 1999), with its head oriented towards the olive branch. Between [[1916]] and [[1945]], the [[Presidential Flag]] showed an eagle facing to its left (the viewer's right), which gave rise to the [[urban legend]] that the seal is changed to have the eagle face towards the olive branch in peace, and towards the arrows in wartime.<ref>{{cite web |url=http://www.snopes.com/history/american/turnhead.htm |title=http://www.snopes.com/history/american/turnhead.htm |accessdate= |format= |work= }}</ref>

[[Image:BaldeagleYSNP.JPG|thumb|right|250px|Bald Eagle at Yellowstone National Park]]
<nowiki>Insert non-formatted text here</nowiki>

== Bald Eagles as religious objects ==
The Bald Eagle is a sacred bird in some North American cultures and its feathers, like those of the [[Golden Eagle]], are central to many [[religious]] and [[spiritual]] customs amongst [[Indigenous peoples of the Americas|Native Americans]]. Some Native Americans revere eagles as sacred religious objects, including the feathers and other parts and are often compared to the [[Bible]] and [[crucifix]] (AP 2004).

Eagle feathers are often used in traditional ceremonies and are used to honor noteworthy achievements and qualities such as exceptional leadership and bravery.

Despite modern and historic Native American practices of giving eagle feathers to non-Native Americans and Native American members of other tribes who have been deemed worthy, current [[eagle feather law]] stipulates that only individuals of certifiable Native American ancestry enrolled in a federally recognized tribe are legally authorized to obtain Bald or Golden Eagle feathers for [[religious]] or [[spiritual]] use (AP 2002) Attempts to extend this permitted use have met with resistance from members of federally recognized Native American tribes, who even under the permissive legislation sometimes have to wait for years before a good specimen can be procured for their use (AP 2004).

==References==
* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30.

* '''Associated Press''' (AP) (2004): ''[http://www.wwrn.org/article.php?idd=4949&sec=73&cont=6 Residents fight to use eagle feathers]''. Retrieved 2006-NOV-30.

* {{IUCN2006|assessors='''BirdLife International'''|year=2004|id=49336|title=Haliaeetus leucocephalus|downloaded=09 May 2006}} Database entry includes justification for why this species is of least concern

* '''Boradiansky''', Tina S. (1990): ''[http://www.animallaw.info/articles/arus30nrj709.htm Conflicting Values: The Religious Killing of Federally Protected Wildlife]''. Retrieved 2006-NOV-30.

* '''DeMeo''', Antonia M. (1995): Access to Eagles and Eagle Parts: Environmental Protection v. Native American Free Exercise of Religion. ''Hastings Constitutional Law Quarterly'' '''22'''(3): 771-813. [http://www.animallaw.info/articles/ar22hstclq771.htm HTML fulltext]

* '''Electronic Code of Federal Regulations''' (e-CFR) (1974): ''Title 50: Wildlife and Fisheries. Part 22 - Eagle Permits''. [http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=8f792182cc6e2d5c11136fe0db280d2b&rgn=div5&view=text&node=50:6.0.1.1.5&idno=50 HTML fulltext]

* '''Wink''', M.; Heidrich, P. & Fentzloff, C. (1996): A mtDNA phylogeny of sea eagles (genus ''Haliaeetus'') based on nucleotide sequences of the cytochrome ''b'' gene. ''Biochemical Systematics and Ecology'' '''24''': 783-791. {{DOI|10.1016/S0305-1978(96)00049-X}} [http://www.uni-heidelberg.de/institute/fak14/ipmb/phazb/pubwink/1996/20_1996.pdf PDF fulltext]

===Footnotes===
<references/>

==External links==
{{commons|Haliaeetus leucocephalus}}
*[http://www.baldeagleinfo.com/ Bald Eagle Info.com]. Retrieved 2006-NOV-30.
*BirdHouses101.com: [http://www.birdhouses101.com/bald-eagle.asp Bald Eagle]. Retrieved 2006-NOV-30.
*[http://www.eraptors.org/index.html Cascades Raptor Center]. Retrieved 2006-NOV-30.
*GreatSeal.com: [http://www.greatseal.com/symbols/turkey.html The Eagle, Ben Franklin, and the Turkey]. Retrieved 2006-NOV-30.
*NE Energy: [http://www.nu.com/eagles/default.asp Barton Island, Massachusetts, Bald Eagle webcam]. Retrieved 2006-NOV-30.
*[[USFWS]]: [http://images.fws.gov/default.cfm?fuseaction=records.display&CFID=2060719&CFTOKEN=64720564&id=5C7D1A7F%2DF41E%2D4C0A%2D87A4F0A6E628BD0E 1.24 MB Bald Eagle JPEG]. Retrieved 2006-NOV-30.



[[Category:Avifauna of Canada]]
[[Category:Avifauna of Southeastern United States]]
[[Category:Avifauna of the United States]]
[[Category:Eagles]]
[[Category:Haliaeetus]]
[[Category:Fauna of Minnesota|Eagle, bald]]

[[be:Белагаловы арол]]
[[cs:Orel bělohlavý]]
[[da:Hvidhovedet havørn]]
[[de:Weißkopfseeadler]]
[[es:Pigargo cabeciblanco]]
[[eo:Blankkapa maraglo]]
[[fr:Pygargue à tête blanche]]
[[it:Haliaeetus leucocephalus]]
[[he:עיטם לבן ראש]]
[[nl:Amerikaanse zeearend]]
[[cr:ᒥᒋᓲ]]
[[ja:ハクトウワシ]]
[[pl:Bielik amerykański]]
[[pt:Águia de cabeça branca]]
[[sk:Orliak bielohlavý]]
[[fi:Valkopäämerikotka]]
[[sv:Vithövdad havsörn]]
[[ta:வெண்தலைக் கழுகு]]

144.37.49.160 at 06:08, 13 December 2006

2006-12-13T06:08:51Z

24.238.200.20: /* Description and systematics */

2006-12-12T22:57:29Z

Description and systematics

72.196.101.1 at 04:50, 12 December 2006

2006-12-12T04:50:02Z

New page

{{otheruses}}

{{Taxobox
| color = pink
| name = Bald Eagle
| status = LC
| image = Haliaeetus leucocephalus.jpg
| regnum = [[Animal]]ia
| phylum = [[Chordata]]
| classis = [[Aves]]
| ordo = [[Falconiformes]]
| familia = [[Accipitridae]]
| genus = ''[[Haliaeetus]]''
| species = '''''H. leucocephalus'''''
| binomial = ''Haliaeetus leucocephalus''
| binomial_authority = ([[Carolus Linnaeus|Linnaeus]], [[1766]])
| subdivision_ranks = [[Subspecies]]
| subdivision =
* ''H. l. leucocephalus'' {{Taxobox_authority | author = (Linnaeus | date = 1766)}} Southern Bald Eagle
* ''H. l. washingtoniensis'' {{Taxobox_authority | author = [[John James Audubon|Audubon]] | date = [[1827]])}} Northern Bald Eagle or Washington's Eagle
| synonyms =
''Falco leucocephalus'' {{Taxobox_authority | author = Linnaeus | date = 1766}} 
}}

The '''Bald Eagle''' ('''''Haliaeetus leucocephalus'''''), also known as the '''American Eagle''', is a [[bird of prey]] found in [[North America]], most recognizable as the [[national bird]] of the [[United States]].

The species was on the brink of [[extinction]] late in the 20th century, but as of 2006 has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].

This [[eagle]] gets both its common and scientific names from the distinctive appearance of the adult's head. ''Bald'' in the [[English language|English]] name refers to the white head feathers, and the scientific name is derived from ''Haliaeetus'', [[New Latin]] for "sea eagle," (from the [[Ancient Greek]] ''haliaetos''), and ''leucocephalus'', Latinized Ancient Greek for "white head", from ''leukos'' ("white") and ''kephale'' ("head").

==Description and systematics==
An immature Bald Eagle has speckled brown [[plumage]], the distinctive white head and body developing 2-3 years later, before sexual maturity. This species is distinguishable from the [[Golden Eagle]] in that the latter has feathers which extend down the legs.

Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).

The northern birds are the [[subspecies]] ''washingtoniensis'', whereas the southern ones belong to the [[nominate subspecies]] ''leucocephalus''. They are separated approximately at [[latitude]] 38° N, or roughly the latitude of [[San Francisco]]; northern birds reach a bit further south on the [[Atlantic Coast]], where they occur south to the [[Cape Hatteras]] area. Audubon's [[type specimen]] of '''"Washington's Eagle"''' - named in honor of [[George Washington]]<ref>
As explicitly stated by Audubon. However, the [[subspecific name]] he chose - ''washingtoniensis'' - means properly "from Washington (state)". There has been considerable confusion, with some authors changing it to ''washingtoni'', "(George) Washington's", but the form as originally written is correct.</ref>
- was apparently an exceptionally large bird, such as are more often found in [[Alaska]]; these have been proposed as subspecies ''alascanus'' or ''alascensis'', but the variation is [[Cline (population genetics)|clinal]] and follows [[Bergmann's Rule]].

The Bald Eagle forms a [[species pair]] with the [[Eurasia]]n [[White-tailed Eagle]]. These diverged from other Sea Eagles at the beginning of the Early [[Miocene]] (c. 10 [[mya (unit)|mya]]) at latest, possibly - if the most ancient fossil record is correctly assigned to this [[genus]] - as early as the Early/Middle [[Oligocene]], some 28 mya (Wink ''et al.'' 1996<ref>
The authors' reservations about using the generalized "2%" rate of [[molecular evolution]] have since proven to be well-founded.</ref>).
As in other sea-eagle species pairs, this one consists of a white-headed (the Bald Eagle) and a tan-headed species. They probably diverged in the North [[Pacific]], spreading westwards into Eurasia and eastwards into [[North America]]. Like the third northern species, [[Steller's Sea-eagle]], they have yellow talons, beaks and eyes in adults.

Bald Eagles are powerful fliers, and also soar on thermal convection currents.

In the wild, Bald Eagles can live about 20-30 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 60 years old.

Bald Eagles normally squeak and have a shrill cry, punctuated by grunts. They do not make the "eagle scream" as often shown on the television. What many recognize as the call of this species is actually the call of a [[Red-tailed Hawk]] dubbed into the film.

==Range, habitat, and restoration==
[[Image:bald.eagle.longshot.arp.500pix.jpg|200px|thumb|left|Adult at Combe Martin Wildlife and Dinosaur Park, North Devon, England]]
The Bald Eagle's natural range covers most of North America, including most of [[Canada]], all of the continental United States, and northern [[Mexico]]. The bird itself is able to live in most of North America's varied habitats from the [[bayou]]s of [[Louisiana]] to the [[Sonoran Desert|Sonoran desert]] and the eastern deciduous forests of [[Quebec]] and [[New England]]. It can be a [[bird migration|migratory]] bird but it also is not unheard of for a nesting pair to overwinter in its breeding area.

Once a common sight in much of the continent, the Bald Eagle was severely affected by the use of the pesticide [[DDT]] in the mid-twentieth century. While the pesticide itself was not lethal to the bird, it made an eagle either sterile or unable to lay healthy eggs: the eagle would ingest the chemical through its food and then lay eggs that were too brittle to withstand the weight of a brooding adult. By the 1960s there were fewer than 500 nesting pairs in the 48 [[Contiguous United States|contiguous states]] of the USA.

Currently it is still slowly but steadily recovering its numbers; Organizations like the [[Fraternal Order of Eagles]] which carry the Eagle as their emblem, have helped the American Bald Eagle on its recovery, by supporting other groups that rescue and preserve the Eagles and their habitat. The Bald Eagle can be found in growing concentrations throughout the United States and [[Canada]], particularly near large [[body of water|bodies of water]]. The [[U.S. state]] with the largest resident population is [[Alaska]]; out of the estimated 70,000 Bald Eagles on [[Earth]], half live there.

Permits are required to keep this species in captivity (e-CFR 1974). As a rule, the Bald Eagle is a poor choice for public shows, being timid, prone to becoming highly stressed, and unpredictable in nature. As remarked above, they can be long-lived in captivity if key demands are met, but do not breed well even under the best conditions. The only Bald Eagle to be born outside North America hatched on [[May 3]], [[2006]] in [[Magdeburg]] Zoo, [[Germany]].

This species has occurred as a [[Vagrancy (biology)|vagrant]] once in [[Ireland]]. The exhausted specimen was discovered by a [[national park]]s worker in a northern [[heath]]. Presumably, a storm blew it out to sea, and the bird struggled across the [[Atlantic Ocean]].

==Reproduction==
[[Image:Haliaeetus leucocephalus1.jpg|thumb|right|Two bald eagle chicks]]
Bald Eagles build huge nests out of branches, usually in large trees near water. The nest may stretch as large as eight feet across and weigh up to a ton (907kg). When breeding where there are no trees, the Bald Eagle will nest on the ground.

Eagles that are old enough to breed often return to the area where they were born. An adult looking for a site is likely to select a spot that contains other breeding Bald Eagles.

Bald Eagles are sexually mature at 4 or 5 years old. Eagles produce between one and three eggs per year, but it is rare for all three chicks to successfully fly. Both the male and female take turns sitting on the eggs. The other parent will hunt for food or look for nest material.

==Diet==
[[Image:Haliaeetus leucocephalus2.jpg|thumb|left|200px|]]
The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well.

To hunt fish, easily their most important live prey, the eagle swoops down over the water and snatches the fish out of the water with its [[talons]]. They eat by holding the fish in one claw and tearing the flesh with the other. Eagles have structures on their toes called [[spiricules]] that allow them to grasp fish. [[Osprey]] also have this adaptation. Bald Eagles have powerful talons. In one case, an eagle was able to fly off with the 6.8 kg (15 lb) carcass of a [[Mule Deer]] fawn.

Sometimes, if the fish is too heavy to lift, the eagle will be dragged into the water. It may swim to safety, but some eagles drown or succumb to [[hypothermia]]. Occasionally, Bald Eagles will pirate fish away from [[Osprey]]s and usually the smaller raptors will have to give up their prey, a practice known as [[kleptoparasitism]].

==National bird of the U.S.==
[[Image:Bald eagle.jpg|thumb|right|250px|Bald Eagle portrait]]
The Bald Eagle is the national bird of the [[United States]] of America. It is probably one of the country's most recognizable symbols, and appears on most of its official seals, including the [[Seal of the President of the United States]].

Its national significance dates back to [[June 20]], [[1782]], when the [[Continental Congress]] officially adopted the current design for the [[Great Seal of the United States]] including a Bald Eagle grasping arrows and an olive branch with its [[talons]]. Some states had earlier adopted the bird as a symbol; for example [[New York State]] did so in 1778.

In 1784, after the end of the [[Revolutionary War]], [[Benjamin Franklin]] wrote a famous letter to his daughter from [[Paris]] criticizing the choice and suggesting the [[Wild Turkey]]'s character as a desirable trait:

<blockquote>''For my own part I wish the Bald Eagle had not been chosen the Representative of our Country. He is a Bird of bad moral character. He does not get his Living honestly. You may have seen him perched on some dead Tree near the River, where, too lazy to fish for himself, he watches the Labour of the Fishing Hawk; and when that diligent Bird has at length taken a Fish, and is bearing it to his Nest for the Support of his Mate and young Ones, the Bald Eagle pursues him and takes it from him.</blockquote>

<blockquote>''With all this Injustice, he is never in good Case but like those among Men who live by Sharping & Robbing he is generally poor and often very lousy. Besides he is a rank Coward: The little [[kingbird|King Bird]] not bigger than a Sparrow attacks him boldly and drives him out of the District. He is therefore by no means a proper Emblem for the brave and honest country of America who have driven all the King birds from our Country...</blockquote>

<blockquote>''I am on this account not displeased that the Figure is not known as a Bald Eagle, but looks more like a Turkey. For the Truth the Turkey is in Comparison a much more respectable Bird, and withal a true original Native of America . . . He is besides, though a little vain & silly, a Bird of Courage, and would not hesitate to attack a Grenadier of the British Guards who should presume to invade his Farm Yard with a red Coat on.''</blockquote>

Despite Franklin's objections, the Bald Eagle remained the emblem of the United States. It can be found on both national seals and on the back of several coins (including the [[Quarter (U.S. coin)|quarter]] dollar coin until 1999), with its head oriented towards the olive branch. Between [[1916]] and [[1945]], the [[Presidential Flag]] showed an eagle facing to its left (the viewer's right), which gave rise to the [[urban legend]] that the seal is changed to have the eagle face towards the olive branch in peace, and towards the arrows in wartime.<ref>{{cite web |url=http://www.snopes.com/history/american/turnhead.htm |title=http://www.snopes.com/history/american/turnhead.htm |accessdate= |format= |work= }}</ref>

[[Image:BaldeagleYSNP.JPG|thumb|right|250px|Bald Eagle at Yellowstone National Park]]

== Bald Eagles as religious objects ==
The Bald Eagle is a sacred bird in some North American cultures and its feathers, like those of the [[Golden Eagle]], are central to many [[religious]] and [[spiritual]] customs amongst [[Indigenous peoples of the Americas|Native Americans]]. Some Native Americans revere eagles as sacred religious objects, including the feathers and other parts and are often compared to the [[Bible]] and [[crucifix]] (AP 2004).

Eagle feathers are often used in traditional ceremonies and are used to honor noteworthy achievements and qualities such as exceptional leadership and bravery.

Despite modern and historic Native American practices of giving eagle feathers to non-Native Americans and Native American members of other tribes who have been deemed worthy, current [[eagle feather law]] stipulates that only individuals of certifiable Native American ancestry enrolled in a federally recognized tribe are legally authorized to obtain Bald or Golden Eagle feathers for [[religious]] or [[spiritual]] use (AP 2002) Attempts to extend this permitted use have met with resistance from members of federally recognized Native American tribes, who even under the permissive legislation sometimes have to wait for years before a good specimen can be procured for their use (AP 2004).
They are endangered.

==References==
* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30.

* '''Associated Press''' (AP) (2004): ''[http://www.wwrn.org/article.php?idd=4949&sec=73&cont=6 Residents fight to use eagle feathers]''. Retrieved 2006-NOV-30.

* {{IUCN2006|assessors='''BirdLife International'''|year=2004|id=49336|title=Haliaeetus leucocephalus|downloaded=09 May 2006}} Database entry includes justification for why this species is of least concern

* '''Boradiansky''', Tina S. (1990): ''[http://www.animallaw.info/articles/arus30nrj709.htm Conflicting Values: The Religious Killing of Federally Protected Wildlife]''. Retrieved 2006-NOV-30.

* '''DeMeo''', Antonia M. (1995): Access to Eagles and Eagle Parts: Environmental Protection v. Native American Free Exercise of Religion. ''Hastings Constitutional Law Quarterly'' '''22'''(3): 771-813. [http://www.animallaw.info/articles/ar22hstclq771.htm HTML fulltext]

* '''Electronic Code of Federal Regulations''' (e-CFR) (1974): ''Title 50: Wildlife and Fisheries. Part 22 - Eagle Permits''. [http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=8f792182cc6e2d5c11136fe0db280d2b&rgn=div5&view=text&node=50:6.0.1.1.5&idno=50 HTML fulltext]

* '''Wink''', M.; Heidrich, P. & Fentzloff, C. (1996): A mtDNA phylogeny of sea eagles (genus ''Haliaeetus'') based on nucleotide sequences of the cytochrome ''b'' gene. ''Biochemical Systematics and Ecology'' '''24''': 783-791. {{DOI|10.1016/S0305-1978(96)00049-X}} [http://www.uni-heidelberg.de/institute/fak14/ipmb/phazb/pubwink/1996/20_1996.pdf PDF fulltext]

===Footnotes===
<references/>

==External links==
{{commons|Haliaeetus leucocephalus}}
*[http://www.baldeagleinfo.com/ Bald Eagle Info.com]. Retrieved 2006-NOV-30.
*BirdHouses101.com: [http://www.birdhouses101.com/bald-eagle.asp Bald Eagle]. Retrieved 2006-NOV-30.
*[http://www.eraptors.org/index.html Cascades Raptor Center]. Retrieved 2006-NOV-30.
*GreatSeal.com: [http://www.greatseal.com/symbols/turkey.html The Eagle, Ben Franklin, and the Turkey]. Retrieved 2006-NOV-30.
*NE Energy: [http://www.nu.com/eagles/default.asp Barton Island, Massachusetts, Bald Eagle webcam]. Retrieved 2006-NOV-30.
*[[USFWS]]: [http://images.fws.gov/default.cfm?fuseaction=records.display&CFID=2060719&CFTOKEN=64720564&id=5C7D1A7F%2DF41E%2D4C0A%2D87A4F0A6E628BD0E 1.24 MB Bald Eagle JPEG]. Retrieved 2006-NOV-30.



[[Category:Avifauna of Canada]]
[[Category:Avifauna of Southeastern United States]]
[[Category:Avifauna of the United States]]
[[Category:Eagles]]
[[Category:Haliaeetus]]
[[Category:Fauna of Minnesota|Eagle, bald]]

[[be:Белагаловы арол]]
[[cs:Orel bělohlavý]]
[[da:Hvidhovedet havørn]]
[[de:Weißkopfseeadler]]
[[es:Pigargo cabeciblanco]]
[[eo:Blankkapa maraglo]]
[[fr:Pygargue à tête blanche]]
[[it:Haliaeetus leucocephalus]]
[[he:עיטם לבן ראש]]
[[nl:Amerikaanse zeearend]]
[[cr:ᒥᒋᓲ]]
[[ja:ハクトウワシ]]
[[pl:Bielik amerykański]]
[[pt:Águia de cabeça branca]]
[[sk:Orliak bielohlavý]]
[[fi:Valkopäämerikotka]]
[[sv:Vithövdad havsörn]]
[[ta:வெண்தலைக் கழுகு]]

170.235.215.18 at 14:01, 11 December 2006

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170.235.215.18 at 13:56, 11 December 2006

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170.235.215.18 at 13:54, 11 December 2006

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66.16.238.114: /* Description and systematics */

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Description and systematics

@@ Line 25: / Line 25: @@
 The '''Bald Eagle''' ('''''Haliaeetus leucocephalus'''''), also known as the '''American Eagle''', is a [[bird of prey]] found in [[North America]], most recognizable as the [[national bird]] of the [[United States]].
-The species was on the brink of [[extinction]] late in the 20th century, but as of 2006 has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].
+The species had been on the brink of [[extinction]] late in the 20th century, but as of 2006 has a stable population and is in the process of being removed from the [[Federal government of the United States|U.S. federal government]]'s list of [[endangered species]].
 This [[eagle]] gets both its common and scientific names from the distinctive appearance of the adult's head. ''Bald'' in the [[English language|English]] name refers to the white head feathers, and the scientific name is derived from ''Haliaeetus'', [[New Latin]] for "sea eagle," (from the [[Ancient Greek]] ''haliaetos''), and ''leucocephalus'', Latinized Ancient Greek for "white head", from ''leukos'' ("white") and ''kephale'' ("head").

@@ Line 44: / Line 44: @@
 Bald Eagles are powerful fliers, and also soar on thermal convection currents.
-In the wild, Bald Eagles can live about 20-30 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 60 years old.
+In the wild, Bald Eagles can live about 25-40 years, and have a maximum life span of approximately 50 years. They generally live longer in captivity; up to 60 years old.
 Bald Eagles normally squeak and have a shrill cry, punctuated by grunts. They do not make the "eagle scream" as often shown on the television.  What many recognize as the call of this species is actually the call of a [[Red-tailed Hawk]] dubbed into the film.

@@ Line 70: / Line 70: @@
 ==Diet==
 [[Image:Haliaeetus leucocephalus2.jpg|thumb|left|200px|]]
-The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well. They are even known to attack humans!!!
+The Bald Eagle's diet is varied, including [[carrion]], [[fish]], smaller [[bird]]s, [[rodent]]s, and sometimes food scavenged or stolen from campsites and picnics. Most prey is quite a bit smaller than the eagle, but rare predatory attacks on large birds such as the [[Snow Goose]], the [[Great Blue Heron]] or even [[swan]]s have been recorded. Also, fairly large [[salmon]] and [[trout]] have been taken as well. They are even known to attack human babies!!!
 To hunt fish, easily their most important live prey, the eagle swoops down over the water and snatches the fish out of the water with its [[talons]].  They eat by holding the fish in one claw and tearing the flesh with the other.  Eagles have structures on their toes called [[spiricules]] that allow them to grasp fish. [[Osprey]] also have this adaptation. Bald Eagles have powerful talons. In one case, an eagle was able to fly off with the 6.8 kg (15 lb) carcass of a [[Mule Deer]] fawn.

@@ Line 104: / Line 104: @@
 ==References==
-* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30.
+* '''Associated Press''' (AP) (2002): ''[http://www.freedomforum.org/templates/document.asp?documentID=16684 Native American gets OK to use eagle feathers in religious practices]''. Retrieved 2006-NOV-30. didiaskjascjnhsdavojhascvygopuiscaygui;sacfguio;dvas'guodsv;gujvds'hodvsjk;gdsv
 * '''Associated Press''' (AP) (2004): ''[http://www.wwrn.org/article.php?idd=4949&sec=73&cont=6 Residents fight to use eagle feathers]''. Retrieved 2006-NOV-30.

@@ Line 32: / Line 32: @@
 An immature Bald Eagle has speckled brown [[plumage]], the distinctive white head and body developing 2-3 years later, before sexual maturity. This species is distinguishable from the [[Golden Eagle]] in that the latter has feathers which extend down the legs.
-Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest (BITCH) specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).
+Adult females have an average wingspan of about 7 feet (2.1 meters); adult males have a wingspan of 6 ft 6 in (2 meters). Adult females weigh approximately 12.8 lb (5.8 kg), males weigh 9 lb (4.1 kg). The smallest specimens are those from Florida, where an adult male may barely exceed 5 lb (2.3 kg) and a wingspan of 6 feet (1.8 meters). The largest are the Alaskan birds, where large females may exceed 15.5 lb (7 kg) and have a wingspan of approximately 8 feet (2.4 meters).
 The northern birds are the [[subspecies]] ''washingtoniensis'', whereas the southern ones belong to the [[nominate subspecies]] ''leucocephalus''. They are separated approximately at [[latitude]] 38° N, or roughly the latitude of [[San Francisco]]; northern birds reach a bit further south on the [[Atlantic Coast]], where they occur south to the [[Cape Hatteras]] area. Audubon's [[type specimen]] of '''"Washington's Eagle"''' - named in honor of [[George Washington]]<ref>