Przewalski's horse
Przewalski's horse (Equus przewalskii or E. ferus przewalskii),  the Mongolian wild horse, is a close relative of the domestic horse.  The two are the only equids that can cross-breed and produce fertile offspring. Przewalski's horse is a rare and endangered subspecies of the wild horse, Equus ferus. It is native to the steppes of central Asia, especially Mongolia.