sentences:  At least 38 species are currently housed in the subfamily, all with signature well-feathered tarsi.This species is a member of the genus "Aquila", which are mostly large, fairly dark colored eagles distributed largely through the more open habitats of Eurasia and Africa (with one in North America and a couple in Australasia).Studies on DNA have indicated that the imperial eagle is part of a subgroup with other moderately sized "Aquila" such as the steppe eagle ("Aquila nipalensis") and the tawny eagle ("Aquila rapax").