Przewalski’s Horse or, Equus ferus przewalski, is considered the oldest horse still in existence, but was not discovered until 1879, well after men domesticated and harnessed the power of the common horse, Equus caballus. The Przewalski horse was discovered by and named after Nikolai Mikailovich Przewalski after he was the first European to view the horse in Mongolia. (One must assume that the animal was known by the indigenous people and was “discovered” by them much earlier.)
Przewalski’s horse is pony-sized (12-14 hands high). It has a dun colored body, dark legs and tail, a dark dorsal stripe, and a light muzzle. In addition, the mane is dark, short, and stands up along the neck. The horse is a herbivore and grazes on local grasses and shrubs. They have not been domesticated effectively and so are the last wild horse.