Equus (genus)
Equus is a genus of mammals in the family Equidae, which includes horses, donkeys, and zebras. Within Equidae, "Equus" is the only recognized extant genus, comprising seven living species. The term equine refers to any member of this genus, including horses. Like Equidae more broadly, "Equus" has numerous extinct species known only from fossils. The genus most likely originated in North America and spread quickly to the Old World. Equines are odd-toed ungulates with slender legs, long heads, relatively long necks, manes (erect in most subspecies), and long tails. All species are herbivorous, and mostly grazers, with simpler digestive systems than ruminants, but able to subsist on lower-quality vegetation.
Ponginae
Ponginae is a subfamily in the family Hominidae. Once a diverse lineage of Eurasian apes, the subfamily has only one extant genus, "Pongo" (orangutans), which contains three extant species; the Sumatran orangutan ("Pongo abelii"), the Tapanuli orangutan ("Pongo tapanuliensis,") and the Bornean orangutan ("Pongo pygmaeus"). All three species are listed as critically endangered by the International Union for Conservation of Nature (IUCN).