This mature bull has a grey nose that earns the designation "Black". Make sense? Blacks range from a brown/dun color to dark black. In addition to the grey on their noses, they often have grey hairs along their back bone and grey flecks in their forehead locks. Wild yaks carry this color pattern and it is generally held that the other colors are the results of crosses to Bos Taurus or Bos Indicus genes. More links to photos of our Tibetan Black Yaks:
Black Tibetan Yak Cow - Pepper