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''Aquila'' is the genus of true eagles. It is often united with the buteos, sea eagles, and other more heavyset Accipitridae, but more recently it appears as if they are less distinct from the more slender accipitrine hawks than believed. Eagles are not a natural group, but denote essentially any bird of prey large enough to hunt sizeable (about 50 cm long or more overall) vertebrate prey. ==Species== ''Aquila'' belongs to an extremely close-knit group of "typical" eagles. These include genera such as ''Hieraaetus'', ''Lophaetus'', ''Ictinaetus'', and the extinct ''Harpagornis'', and all these appear to be paraphyletic with regards to the traditional ''Aquila''. Especially some, if not all, species of ''Hieraaetus'', separated primarily due to their smaller size, seem to belong here. The entire "typical eagle" group is in need of a thorough revision, thus this species list cannot be more than a tentative one at present. Most problematic is certainly ''Hieraaetus'', the hawk-eagles. The type species, the booted eagle, is known to be very close to some ''Aquila'' eagles. Other hawk-eagles might indeed be distinct enough to warrant generic separation, but the name ''Hieraaetus'' is not available for them, being a junior synonym of ''Aquila'' as the booted eagle is included herein. * Bonelli's eagle, ''Aquila fasciata'' – formerly ''Hieraaetus fasciatus'' *Cassin's hawk-eagle, ''Aquila africana'' * African hawk-eagle, ''Aquila spilogaster'' – formerly 'Hieraaetus spilogaster'' * Booted eagle, ''Aquila pennata'' – formerly ''Hieraaetus pennatus'' * Rufous-bellied eagle, ''Aquila kienerii'' – formerly ''Hieraaetus kienerii'' * Golden eagle, ''Aquila chrysaetos'' * Eastern imperial eagle, ''Aquila heliaca'' * Spanish imperial eagle ''Aquila adalberti'' * Steppe eagle, ''Aquila nipalensis'' * Tawny eagle, ''Aquila rapax'' * Verreaux's eagle, ''Aquila verreauxii'' * Gurney's eagle, ''Aquila gurneyi'' * Wahlberg's eagle, ''Aquila wahlbergi'' * Wedge-tailed eagle, ''Aquila audax'' * * Tasmanian wedge-tailed eagle, ''Aquila audax fleayi'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aquila (genus)」の詳細全文を読む スポンサード リンク
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