Equidae
Equidae (sometimes known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils. All extant species are in the genus "Equus". Equidae belongs to the order Perissodactyla, which includes the extant tapirs and rhinoceros, and several extinct families.
Martial eagle
The Accipitridae (hereafter accipitrids) family is by far the most diverse family of diurnal raptors in the world with more than 230 currently accepted species. As a member of the booted eagle subfamily, Aquilinae, it is one of the roughly 15% extant species of the family to have feathers covering its legs. This may be a useful feature for distinguishing these species from other eagles and raptors, as they are present even in tropical species such as the martial eagle. Under current classifications, booted eagles consist of approximately 38 living species that are distributed in every continent inhabited by the accipitrids, which excludes only the continent of Antarctica. Just under half of the living species of booted eagle are found in Africa. Studies have been conducted on the mitochondrial DNA of most booted eagle species, including the martial eagle, in order to gain insight on how the subfamily is ordered and which species bear relation to one another. DNA testing in the 1980s indicated the martial eagle was a specialized off-shoot of the small-bodied "Hieraaetus" eagles and one study went so far as to advocate that the martial eagle be included in the genus. However, more modern and comprehensive genetic testing has shown that the martial eagle is extremely distinct from other living booted eagles and diverged from other existing genera several million years ago. Genetically, the martial eagle fell between two other species in monotypical genera, the African long-crested eagle ("Lophaetus occipitalis") and the Asian rufous-bellied eagle ("Lophotriorchis kienerii"), that similarly diverged long ago from other modern species. Given the disparity of this species’ unique morphology and that the two aforementioned most closely related living species are only about as large as the bigger buzzards, the unique heritage of the martial eagle is considered even superficially evident. There are no subspecies of martial eagle and the species varies little in appearance and genetic diversity across its distribution.