The horse (Equus ferus caballus) is one of two extant subspecies of Equus ferus. It is an odd-toed 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, Eohippus, into the large, single-toed animal of today. The endangered Przewalski's horse (also known as the Mongolian Wild Horse) is a separate subspecies and the only remaining true wild horse.