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.
Booidea
The Booidea, also known as booid snakes, are a superfamily of snakes that contains boas (family Boidae) and other closely related boa-like snakes (but not pythons, which are in a separate superfamily called Pythonoidea). As of 2017, Booidea contains 61 species, including the eponymous Neotropical "Boa constrictor", anacondas (genus "Eunectes"), and smaller tree and rainbow boas ("Corallus", "Epicrates", and "Chilabothrus") as well as several genera of booid snakes from various locations around the world: "Candoia" from New Guinea and Melanesia, sand boas ("Eryx") from northeast Africa, the Middle East, and southwestern Asia, "Charina" and "Lichanura" from North America, "Ungaliophis" and "Exiliboa" from Central America, "Acrantophis" and "Sanzinia" from Madagascar, and "Calabaria" from tropical west-central Africa.