Horse

The horse (Equus ferus caballus)[2][3] is one of two extant subspecies of equus ferus, or the wild horse. It is a single-hooved (ungulate) mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature into the large, single-toed animal of today. Humans began to domesticate horses around 4000 BC, and their domestication is believed to have been widespread by 3000 BC. Most horses today are domesticated and are members of the subspecies caballus, though there are still endangered populations of the Przewalski's Horse, a separate subspecies, in the wild. Przewalski's Horse is the only remaining true wild horse, as the more common populations of "wild horses" are feral horses which live in the wild but are descended from domesticated ancestors. There is an extensive, specialized vocabulary used to describe equine-related concepts, covering everything from anatomy to life stages, size, colors, markings, breeds, locomotion, and behavior.