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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 bulls weigh 1,600 to 2,000 pounds and stand 5.5 to 6.5 feet at the shoulder. They measure 9.5 to 11.5 feet in total length (including the tail). Bison usually live no longer than 20 years, but some have been known to live as long as 40 years. The cow is smaller, weighing up to 1,100 pounds. It is 4.5 to 5.5 feet high and less than 10 feet in length. The cow has a smaller hump than the bull and her horns are more slender and curved than the bull. Bison are definitely social animals and live in herds, although it is not unusual to see an occasional single animal on the prairie.