Bison

Bison stand some 5 to 6.5 feet (1.5 to 2 meters) tall at the shoulder, and can tip the scales at over a ton (907 kilograms). Despite their massive size, bison are quick on their feet. When the need arises they can run at speeds up to 40 miles (65 kilometers) an hour. They sport curved, sharp horns that may grow to be two feet (61 centimeters) long.