Wild yak

The wild yak ("Bos mutus") is a large wild bovid native to the Himalayas in Central Asia. It is the ancestor of the domestic yak ("Bos grunniens").
Most yaks are domestic, which means they live on farms run by people. There are a few wild yak but there are not many left and are in danger of extinction. There may be as few as 100 yak left in the wild. Wild male yaks stand about 2–2.2 meters tall at the shoulder, the females about 1 metre. Domestic Yaks are shorter, between 1 and 2 metres for both males and females. All yaks have long, thick hair to keep them warm in the cold places they live. Wild yaks can be black or brown. Some domestic yaks are white. All kinds of yaks have horns. 
Life.
Yaks are herd animals. This means they live in groups called "herds". Yaks are "herbivores", they don't eat meat. The oldest yaks can live up to 25 years.