Equus (genus)

Equus Temporal range: 5.33–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Earliest Pliocene to recent[1]
Clockwise (from top left): plains zebra (E. quagga), domestic horse (E. f. caballus), onager (E. hemionus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Subtribe:	Equina
Genus:	Equus Linnaeus, 1758
Type species
Equus caballus [2] Linnaeus, 1758
Extant species
E. africanus (African wild ass) E. caballus (domestic horse) E. ferus (wild horse) E. grevyi (Grévy's zebra) E. hemionus (onager) E. kiang (kiang) E. quagga (plains zebra) E. zebra (mountain zebra)

Equus (/ˈɛkwəs, ˈiːkwəs/)^[3] is a genus of mammals in the family Equidae, which includes horses, asses, and zebras. Within the Equidae, Equus is the only recognized extant genus, comprising seven living species. Like Equidae more broadly, Equus has numerous extinct species known only from fossils. The genus originated in North America and dispersed into the Old World and South America during the Early and Middle Pleistocene. 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.

While the domestic horse and donkey (along with their feral descendants) exist worldwide, wild equine populations are limited to Africa and Asia. Wild equine social systems are in two forms; a harem system with tight-knit groups consisting of one adult male or stallion/jackass, several females or mares/jennets, and their young or foals; and a territorial system where males establish territories with resources that attract females, which associate very fluidly. In both systems, females take care of their offspring, but males may play a role as well. Equines communicate with each other both visually and vocally. Human activities have threatened wild equine populations.