Bald Eagle (in the pic)
-
Eagles are large, powerful birds of prey.
-
Eagles have large, hooked beaks.
-
Eagles have excellent eyesight.
-
Eagles have powerful talons which help them catch prey.
-
Eagles build their nests on high cliffs or in tall trees.
-
There are over 60 different species of eagle around the world.
-
Eagles feature prominently on the coat of arms
of a large number of countries, such as Germany, Mexico, Egypt, Poland
and Austria.
-
Golden eagles have been known to hunt foxes, wild cats and even young deer and goats.
-
Female golden eagles usually lay between one and four eggs each breeding season.
-
Bald eagles aren’t actually bald. More bald eagle facts.
Eagles are large, powerfully built
birds of prey, with a heavy head and beak. Even the smallest eagles, like the
Booted Eagle (
Aquila pennata) (which is comparable in size to a
Common Buzzard (
Buteo buteo) or
Red-tailed Hawk (
B. jamaicensis)),
have relatively longer and more evenly broad wings, and more direct,
faster flight – despite the reduced size of aerodynamic feathers. Most
eagles are larger than any other raptors apart from some
vultures. The smallest species of eagle is the
South Nicobar Serpent Eagle (
Spilornis klossi),
at 450 g (1 lb) and 40 cm (16 in). The largest species are discussed
below. Like all birds of prey, eagles have very large hooked
beaks for tearing flesh from their prey, strong muscular legs, and powerful
talons.
The beak is typically heavier than that of most other birds of prey.
Eagles' eyes are extremely powerful, having up to 3.6 times human acuity
for the
martial eagle, which enables them to spot potential prey from a very long distance.
[2] This keen eyesight is primarily attributed to their extremely large pupils which ensure minimal
diffraction (scattering) of the incoming light. The female of all species of eagle known is larger than the male.
[3][4]
Eagles normally build their nests, called
eyries,
in tall trees or on high cliffs. Many species lay two eggs, but the
older, larger chick frequently kills its younger sibling once it has
hatched. The dominant chick tends to be the female, as they are bigger
than the male. The parents take no action to stop the killing.
[5][6]
Due to the size and power of many eagle species, they are ranked at the top of the food chain as
apex predators in the avian world. The type of prey varies from genus to genus. The
Haliaeetus and
Ichthyophaga eagles prefer to capture fish, though the species in the former often capture various animals, especially other
water birds, and are powerful
kleptoparasites of other birds. The snake and serpent eagles of the genera
Circaetus,
Terathopius and
Spilornis predominantly prey on the great diversity of
snakes that are found in the tropics of
Africa and
Asia. The eagles of the genus
Aquila are often the top birds of prey in open habitats, taking almost any medium-sized
vertebrate they can catch. Where
Aquila eagles are absent, other eagles, such as the
buteonine Black-chested Buzzard-Eagle of
South America, may assume the position of top raptorial predator in open areas. Many other eagles, including the species-rich
Spizaetus
genus, live predominantly in woodlands and forest. These eagles often
target various arboreal or ground-dwelling mammals and birds, which are
often unsuspectingly ambushed in such dense, knotty environments.
Hunting techniques differ among the species and genera, with some
individual eagles having engaged in quite varied techniques based their
environment and prey at any given time. Most eagles grab prey without
landing and take flight with it so the prey can be carried to a perch
and torn apart.
[7] The
Bald Eagle
is noted for having flown with the heaviest load verified to be carried
by any flying bird, since one eagle flew with a 6.8 kg (15 lb)
mule deer fawn.
[8]
However, a few eagles may target prey considerably heavier than
themselves; such prey is too heavy to fly with and thus it is either
eaten at the site of the kill or taken in pieces back to a perch or
nest.
Golden and
Crowned Eagles have killed
ungulates weighing up to 30 kg (66 lb) and a
Martial Eagle even killed a 37 kg (82 lb)
duiker, 7–8 times heavier than the predating eagle.
[7][9] Authors on birds
David Allen Sibley,
Pete Dunne
and Clay Sutton, described the behavioral difference between hunting
eagles and other birds of prey thus (in this case the Bald and Golden
Eagles as compared to other North American raptors):
[10]
They have at least one singular characteristic. It has been
observed that most birds of prey look back over their shoulders before
striking prey (or shortly thereafter); predation is after all a
two-edged sword. All hawks seem to have this habit, from the smallest
kestrel to the largest Ferruginous – but not the Eagles.
Among the eagles are some of the largest birds of prey: only the
condors and some of the
Old World vultures
are markedly larger. It is regularly debated which should be considered
the largest species of eagle. They could be measured variously in total
length, body mass or wingspan. Different lifestyle needs among various
eagles result in variable measurements from species to species. For
example, many forest-dwelling eagles, including the very large
Harpy and
Philippine Eagles,
have relatively short wingspans, a feature necessary for being able to
maneuver in quick, short bursts through dense forested habitats.
[7] On the other hand, eagles in the genus
Aquila are found almost strictly in open country, are superlative soarers, and have relatively long wings for their size.
[7]
Here are lists of the top five eagles going on weight, length and,
lastly, wingspan. Unless otherwise noted via reference, the figures
listed are the median reported for each measurement in the guide
Raptors of the World (Ferguson-Lees, et al.), in which only measurements that could be personally verified by the authors were listed.
[7]
Species
Wedge Tailed Eagle in Australia
Major new research into eagle
taxonomy suggests that the important genera
Aquila and
Hieraaetus
are not composed of nearest relatives, and it is likely that a
reclassification of these genera will soon take place, with some species
being moved to
Lophaetus or
Ictinaetus.
[15]
Family
Main article:
Accipitridae
- Subfamily Buteoninae – hawks (buzzards), true eagles and seaeagles
- Genus Geranoaetus
- Genus Harpyhaliaetus
- Genus Morphnus
- Genus Harpia
- Genus Pithecophaga
- Genus Harpyopsis
- Genus Oroaetus
- Genus Spizaetus
- Crested Hawk-Eagle, Spizaetus cirrhatus
- Mountain Hawk-Eagle, S. nipalensis
- Blyth's Hawk-Eagle, S. alboniger
- Javan Hawk-Eagle, S. bartelsi
- Sulawesi Hawk-Eagle, S. lanceolatus
- Philippine Hawk-Eagle, S. philippensis
- Wallace's Hawk-Eagle, S. nanus
- Black Hawk-Eagle, S. tyrannus
- Ornate Hawk-Eagle, S. ornatus
- Black-and-white Hawk-Eagle, S. melanoleucus
- Genus Lophaetus
- Genus Stephanoaetus
- Genus Polemaetus
- Genus Hieraaetus
- Genus Harpagornis (extinct)
- Haast's Eagle, †Harpagornis moorei – possibly belongs in either Hieraaetus or Aquila[16]
- Genus Lophotriorchis
- Genus Aquila
- Bonelli's Eagle, Aquila fasciata – formerly in Hieraaetus fasciatus
- Cassin's Hawk-Eagle, A. africana – formerly in Hieraaetus or Spizaetus genera
- Booted Eagle, A. pennata – formerly Hieraaetus pennatus
- Golden Eagle, A. chrysaetos
- Eastern Imperial Eagle, A. heliaca
- Spanish Imperial Eagle A. adalberti
- Steppe Eagle, A. nipalensis
- Tawny Eagle, A. rapax
- Greater Spotted Eagle, A. clanga – to be moved to Lophaetus or Ictinaetus
- Lesser Spotted Eagle, A. pomarina – to be moved to Lophaetus or Ictinaetus
- Indian Spotted Eagle, A. hastata – to be moved to Lophaetus or Ictinaetus
- Verreaux's Eagle, A. verreauxii
- Gurney's Eagle, A. gurneyi
- Wahlberg's Eagle, A. wahlbergi
- Wedge-tailed Eagle, A. audax
- Genus Ictinaetus
- Genus Haliaeetus
- Genus Ichthyophaga
Short-toed Snake Eagle in flight
- Subfamily Circaetinae: snake-eagles
- Genus Terathopius
- Genus Circaetus
- Genus Spilornis
- Genus Eutriorchis
- Madagascar Serpent Eagle, Eutriorchis astur
Eagles in culture
Etymology
The modern English term for the bird is derived from Latin: aquila by way of French: aigle. The origin of aquila is unknown, but it is believed to possibly derive from either aquilus (meaning dark-colored, swarthy, or blackish) as a reference to the plumage of eagles or from aquilo (meaning north wind).
Old English used the term earn, related to Scandinavia's ørn / örn. It is similar to other Indo-European terms for "bird" or "eagle", including Greek: ὄρνις (ornís), Russian: орёл (orël), and Welsh: eryr. The Albanian word for eagle is shqiponjë, deriving from the root shqipe.
In Britain before 1678, eagle referred specifically to the Golden Eagle, with the other native species, the White-tailed Eagle, being known as erne. The modern name "Golden Eagle" for aquila chrysaetos was introduced by naturalist John Ray.[citation needed]
Religion
The Moche people of ancient Peru worshiped the animal and often depicted eagles in their art.[17]
Despite modern and historic Native American practices of giving eagle
feathers to non-indigenous people and also members of other tribes who
have been deemed worthy, current United States eagle feather law stipulates that only individuals of certifiable Native American ancestry enrolled in a federally recognized tribe are legally authorized to obtain eagle feathers for religious or spiritual reasons.[18]
In Canada, poaching of eagle feathers for the booming U.S. market has
sometimes resulted in the arrests of First Nations person for the crime.[19]
In Hindu religion, Garuda is a lesser Hindu divinity, usually the mount (vahanam) of Vishnu. Garuda is depicted as having the golden body of a strong man with a white face, red wings, and an eagle's beak and with a crown on his head. This ancient deity was said to be massive, large enough to block out the sun.
The eagle is also the patron animal of Zeus. In particular, Zeus was said to have taken the form of an eagle in order to abduct Ganymede,
and there are numerous artistic depictions of the Eagle Zeus bearing
Ganymede aloft, from Classical times up to the present (see
illustrations in the Ganymede (mythology) page.)
The Eagle is also the symbol of Libby, Montana which was recently named "The City of Eagles"[20][21]
As national symbols
Eagles have been used by many nations as a national symbol.
- The coat of arms of Albania has a black double-headed eagle. Furthermore the eagle gives Albania its name ( in Albanian Shqiperia meaning Land of the eagles) and Albanians call themselves shqipetar or shqipe meaning eagles.
- The coat of arms of Armenia has a gold eagle and lion.
- The coat of arms of Austria has a black eagle.
- The coat of arms of the Czech Republic integrates the symbols of Moravia and Silesia (both with female eagles in their emblems – red-and-white chequered and black respectively) on the coat of arms of the Czech Republic with Bohemia's lion.
- The coat of arms of Egypt is a golden eagle looking towards the viewer's left. It is taking from the golden Eagle of Saladin founded on Saladin Citadel of Cairo.
- The coat of arms of Germany has a black eagle.
- The coat of arms of Ghana has two golden eagles holding it.
- The coat of arms of Iceland has an eagle holding it, as well as a dragon, a bull and a giant.
- The coat of arms of Indonesia has an eagle-like garuda carrying a shield on its neck and a banner on its feet.
- The coat of arms of Iraq has the golden Eagle of Saladin.
- The coat of arms of Mexico has a golden eagle perched upon a cactus devouring a snake.
- The coat of arms of Moldova consists of a stylized eagle holding a cross in its beak and a sceptre and a branch in its claws.
- The coat of arms of Montenegro represents the two-headed eagle in flight.
- The coat of arms of Navarre/Basque Country Kingdom has a black eagle.
- The coat of arms of Nigeria has a red eagle on top.
- The coat of arms of Palestine has the golden Eagle of Saladin.
- The coat of arms of Panama has a harpy eagle.
- The coat of arms of the Philippines has the bald eagle of the United States as a symbol of its colonial past, but the Monkey-eating Eagle is the de jure National Bird of the country.
- The coat of arms of Poland has a white eagle with a golden beak and talons wearing a golden crown.
- The coat of arms of Romania has a golden aquila holding a cross in its beak and a mace and a sword in its claws.
- The coat of arms of Russia has a gold double-headed eagle.
- The coat of arms of Serbia has a white bicephalic eagle of the House of Nemanjić.
- The coat of arms of Syria formerly had the eagle of Saladin.
- The Great Seal of the United States has a bald eagle.
- The coat of arms of Yemen depicts a golden eagle with a scroll between its claws.
- The coat of arms of Zambia has an orange red eagle on top.
- The Polish and the Serbian eagles are distinguished by their white color.
Historic uses:
- The Ptolemaic rulers of Egypt used it as their seal.
- Napoleon I used the Roman Golden Eagle as the symbol of his new French empire.
- Persian Empire: the symbol of Persian Army was an Eagle.
- The Romans used it on the standards of their armies. From this derives:
- The late Byzantine Empire
chose a two-headed golden eagle as its symbol. It is popularly that one
head symbolised ancient Rome, and the other head symbolized "new Rome"
at Constantinople. From this derives:
- The two-headed eagle is the emblem of "Shqipëria" or Land of the Eagles, which is known in English as Albania (see The Tale of the Eagle for the legendary origin of the name).
- After the fall of Constantinople, the Russian Empire took the two-headed eagle as its own symbol.
- After his crowning as the new Roman Emperor, Charlemagne adopted the ancient Roman eagle as his own symbol. The Holy Roman Empire born of his kingdom took the eagle, but the Habsburgs replaced the golden eagle by an imperial eagle. From this derives:
- The Seljuk Turks and Ottoman Turks used a double-headed eagle as coats-of-arms.
- During the 1930s and 1940s Hitler's Nazi Germany used a black eagle with its wings outstretched and clutching a swastika as its insignia.
References
- ^ del Hoyo, J.; Elliot, A. & Sargatal, J. (editors). (1994). Handbook of the Birds of the World Volume 2: New World Vultures to Guineafowl. Lynx Edicions. ISBN 84-87334-15-6
- ^ Shlaer, Robert (1972). "An Eagle's Eye: Quality of the Retinal Image". Science 176 (4037): 920–922. doi:10.1126/science.176.4037.920. PMID 5033635. Retrieved 2012-04-16.
- ^ Leclerc, Georges Louis, Comte de Buffon (2010). The
Natural History of Birds: From the French of the Count de Buffon;
Illustrated with Engravings, and a Preface, Notes, and Additions, by the
Translator. Cambridge University Press. pp. 60–. ISBN 978-1-108-02298-9.
- ^ Grambo, Rebecca L. (2003). Eagles. Voyageur Press. ISBN 978-0-89658-363-4.
- ^ Grambo, Rebecca L (2003). Eagles. Voyageur Press. p. 32. ISBN 978-0-89658-363-4.
- ^ Stinson, Christopher H (1979). "On the Selective Advantage of Fratricide in Raptors". Evolution 33 (4): 1219–1225. doi:10.2307/2407480.
- ^ a b c d e Ferguson-Lees, J.; Christie, D. (2001). Raptors of the World. London: Christopher Helm. ISBN 0-7136-8026-1.
- ^ "Amazing Bird Records". Trails.com. Retrieved 2012-07-20.
- ^ Watson, Jeff (2011). The Golden Eagle: Second Edition. ISBN 978-0-30017-019-1.
- ^ Sutton, C.; Dunne, P.; Sibley, D. (1989). Hawks in Flight: The Flight Identification of North American Migrant Raptors. Boston: Houghton Mifflin Harcourt. ISBN 0-3955-1022-8.
- ^ a b del Hoyo, J; Elliot, A; Sarg
- Barcelona: Lynx Edicions. ISBN 84-87334-20-2.
- ^ Gamauf, A., Preleuthner, M., and Winkler, H. (1998). "Philippine Birds of Prey: Interrelations among habitat, morphology and behavior". The Auk 115 (3): 713–726. doi:10.2307/4089419.
- ^ Morgan, A.M. "The spread and weight of the Wedge-tailed Eagle". South Australian Ornithologist 11: 156–157.
- ^ Wood, Gerald (1983). The Guinness Book of Animal Facts and Feats. ISBN 978-0-85112-235-9.
- ^ Lerner,
H. R. L.; Mindell, D. P. (2005). "Phylogeny of eagles, Old World
vultures, and other Accipitridae based on nuclear and mitochondrial
DNA". Molecular Phylogenetics and Evolution 37 (2): 327–346. doi:10.1016/j.ympev.2005.04.010. PMID 15925523.
- ^ Bunce, M.; et al. (2005). "Ancient DNA Provides New Insights into the Evolutionary History of New Zealand's Extinct Giant Eagle". PLoS Biol 3 (1): e9. doi:10.1371/journal.pbio.0030009. PMC 539324. PMID 15660162.
- ^ Larco Herrera, Rafael and Berrin, Kathleen (1997) The Spirit of Ancient Peru Thames and Hudson, New York, ISBN 0500018022
- ^ Office of Law Enforcement. "National Eagle Repository". Mountain-Prairie Region. United States Fish and Wildlife Service. Archived from the original on 2007-10-10. Retrieved 2007-11-20.
- ^ Sin, Lena (2006-04-30). "Charges laid in eagle-poaching case". The Province (CanWest MediaWorks Publications Inc.). Retrieved 2007-11-20.
- ^ Berget, Todd. "Custom Iron Eagles".
- ^ Libby, Montana: City of Eagles. Roadsideamerica.com. Retrieved on 2013-03-02.
Further reading