Bison are large, vegetarian mammals. Bulls can weigh near 1,800 pounds and females average about 1,000 pounds.
Bison breed from mid-July to mid-August. Calves are born singly in the spring. They are strict vegetarians, grazing on grasses and sedges as they move between meadows, foothills, and high-elevation plateaus.
Once distributed across the Great Plains, wild bison are now limited to pockets. There has been a wild population in Yellowstone National Park in the United States since prehistoric times.
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