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Bison and her calf in Yellowstone National Park (David Grubbs/Billings Gazette. Source: magicalnaturetour

Bison stand some 5 to feet to 2 meters) tall at the shoulder, and can tip the scales at over a ton kilograms). Despite their massive size, bison are quick on their feet. When the need arises they can run at speeds up to 40 miles kilometer