The yak (Bos grunniens, but also Poephagus grunniens, though this new name is not universally accepted) is a long-haired bovine found throughout the Himalayan region of south Central Asia, the Qinghai-Tibetan Plateau and as far north as Mongolia. In addition to a large domestic population, there is a small, vulnerable wild yak population. In Tibetan, the word yak refers only to the male of the species; a female is a dri or nak. In most languages which borrowed the word, including English, yak is usually used for both sexes. Yaks, both domestic and wild, are herd animals. Wild yaks stand about two meters tall at the shoulder and domesticated yaks are about half that height. Both types have long shaggy hair to insulate them from the cold. Wild yaks can be either brown or black. Domesticated ones can also be white. Both males and females have horns. Wild yaks