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American Bison

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Normally, buffalo calves are born during April, May, or June, although births have been recorded in all months. Newborn calves are reddish in color, and retain this natal coat until about three months of age, when it is replaced by the dark brown coat of the adult. The calves weigh between 20 and 70 pounds at birth. They grow rapidly and within one year may weigh from 400 to 600 pounds. Two-year-old animals may weigh up to about 1100 pounds. The cows continue to increase in weight until six or seven years of age, occasionally reaching a weight of 1100 pounds. The bulls increase in weight until nine or 10 years of age and very large bulls may weigh more than 2000 pounds. The average weight of mature bulls is about 1600 pounds.

Credits: U.S. Fish and Wildlife Service
Creator: Achtenberg, Jesse

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