Tianzhu white yak
The breed has a medium body size and fine structure, a well developed forepart but a less-developed rare and strong but short legs. And there are big differences in size between the two sexes. Compared to the females, the males have larger heads with a wider forehead, longer and coarser horns with a visible contour, a larger mouth and broader muzzle, thinner lips, smaller nose and a coarser neck. The sex dimorphism is grater in the Tianzhu white yak than in other breeds.
Found in Tianzhu county of Gansu province, which is located in the eastern end of the Qilian Mountains and the northern edge of the Qinghai-Tibetan Plateau.