They have dark brown hair between their curving horns. Bison are mainly brownish-black. They are covered with a thick 'blanket' fur. The bison have short legs. Bison herds can run over 30 miles an hour.
Bison are about six feet tall.
The male is larger than the female. In spring, a cow gives birth to one calf. Baby bison are called calves. They are a reddish brown color. Bison eat grass.