A member of the mammalian cattle family Bovidae in the order Artiodactyla. It is the least-known species of wild cattle alive today. Yaks (Bos grunniens) have been domesticated for at least several hundred years. They are powerful yet docile. Above 2000 m (6600 ft), they are the most useful domestic mammal. They are used for meat and milk production, as a mount, and as a beast of burden. The hair is used for making cloth and tents, the dung is used as fuel, and the tail serves as a flybrush.