Lithograph entitled: "Buffalo bull chasing back. Turn about is fair play." Bison were hunted almost to extinction in the 19th century and were reduced to a few hundred by the mid-1880s. They were hunted for their skins, with the rest of the animal left behind to decay on the ground. After the animals rotted, their bones were collected and shipped back east in large quantities. The federal government promoted bison hunting for various reasons, to allow ranchers to range their cattle without competition from other bovines, and primarily to weaken the North American Indian population by removing their main food source and to pressure them onto the reservations.