The Przewalski horse, also known as the Mongolian wild horse or Takhi, is the only wild subspecies of horse in existence. It became extinct in the wild in 1968, but Przewalski horses bred in captivity have since been reintroduced to the wild. It is estimated that there 1,000 Przewalski horses worldwide, and It remains an endangered subspecies. It has a stocky body, sturdy legs and short neck and the hair of the mane stands erect. The lower part of the tail consists of longer hair, which is dark in colour, while the hair of the upper part of the tail is shorter and lighter in colour.