The yak, also known as the Tartary ox, grunting ox, or hairy cattle, is a species of long-haired domesticated cattle found throughout the Himalayan region of Gilgit-Baltistan, Nepal, Sikkim (India), the Tibetan Plateau, (China), Tajikistan and as far north as Mongolia and Siberia. It is descended from the wild yak.

Bos is a genus of bovines, which includes, among others, wild and domestic cattle.