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The female gives birth to one calf after about nine months. She will go to an isolated area to give birth. Newborn bison are reddish brown and can stand shortly after birth. The mother and her calf will stay isolated from the herd for a couple of days.At about two months, the calf will begin to develop shoulder humps and horns. The calf is usually weaned by the time it is seven months old.he American bison is the largest land animal in North America. Males can stand six feet from hoof to shoulder and weigh between 1000-2000 pounds. Females are around five feet tall and weigh between 800-1000 pounds.
Bison's only significant predators are wolves and grizzlies that usually have to content themselves with preying on stray calves or old, weakened adults.The bison's primary defense is to stampede, running away from predators at speeds up to 32 miles per hour, faster than a wolf.