Bison are nomadic grazers and travel in herds. The bulls leave the herds of females at two or three years of age, and join a herd of males, which usually are smaller than female herds. Mature bulls rarely travel alone. Towards the end of the summer, for the reproductive season, the sexes necessarily commingle.
Bison are nomadic grazers and travel in herds The bulls leave the herds of females at two or three years of age and join a herd of males which usually are smaller than female herds Mature bulls rarely travel alone Towards the end of the summer for the reproductive season the sexes necessarily commingle