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However, according to the findings of a 2014 study, the sister relationship between larger clades of Accipitriformes was well supported (e.g. relationship of Harpagus kites to buzzards and sea eagles and these latter two with Accipiter hawks are sister taxa of the clade containing Aquilinae and Harpiinae).
Many well-known birds such as hawks, eagles, kites, harriers and Old World vultures are included in this group. The osprey is usually placed in a separate family ( Pandionidae ), as is the secretary bird ( Sagittariidae ), and the New World vultures are also usually now regarded as a separate family or order.
The fish eagles, booted eagles, and harpy eagles have traditionally been placed in the subfamily Buteoninae together with the buzzard-hawks (buteonine hawks) and harriers. Some authors may treat these groups as tribes of the Buteoninae; Lerner & Mindell [ 26 ] proposed separating the eagle groups into their own subfamilies of Accipitridae .
The ornate hawk-eagle is a member of the booted eagle subfamily, with the signature well-feathered tarsus present on both tropical and temperate species (and shared, presumably through convergent evolution, with a pair of buteonine hawks). [4] [6] It is one of four living members of the Spizaetus species of "hawk-eagle" native to the neotropics.
The African hawk-eagle is powerfully built and hunts small to medium-sized mammals and birds predominantly, occasionally taking reptiles and other prey as well. [4] The call is a shrill kluu-kluu-kluu. [5] The African hawk-eagle is considered a fairly stable species and a species of Least Concern per the IUCN. [1]
The mountain hawk-eagle, Flores hawk-eagle (which is the only hawk-eagle in its small-island range) and Legge's hawk-eagle, in decreasing magnitude of size, are all are larger and bulkier than the changeable hawk-eagle whereas other Nisaetus species are smaller to varying degrees, distinctly so in the Wallace's hawk-eagle and Blyth's hawk-eagle.
The crowned eagle, also known as the African crowned eagle or the crowned hawk-eagle (Stephanoaetus coronatus), is a large bird of prey found in sub-Saharan Africa; in Southern Africa, it is restricted to more easterly areas. [2] Its preferred habitats are principally riparian woodlands and various forests. [2]
Spizaetus is the typical hawk-eagle birds of prey genus found in the tropics of the Americas. It was however used to indicate a group of tropical eagles that included species occurring in southern and southeastern Asia and one representative of this genus in the rainforests of West Africa .