Bison once roamed the Great Plains of North America. During the 19th century their numbers greatly declined, but they have rebounded slowly, with more than 200,000 bison living on preserves and ranches. Fort Robinson has approximately 150 bison. Bison are North America's largest land animals. Mature cows can weigh up to 1,000 pounds and bulls as much as 2,000 pounds. They stand taller than six feet and are 10-13 feet long. Despite their size, they are athletic, able to run up to 40 miles per hour and jump up to six feet vertically, skills developed to protect them from predators. Plains Indians used every part of a bison, including hides for tepee coverings, bedding, clothes, moccasins, and robes, and other parts for rope, rattles, dishes, spoons, whips, saddles, glue, toys, drums, belts, and more. Bison also served as a primary food source for the Plains Indians. Though commonly called buffalo, bison live only in North America, while the two main species of buffalo live in Africa and Asia.