Yellowstone National Park's Record of Decision on Bison Management

Bison herds once roamed the American Plains by the millions and were a staple in the lives of Native Americans. By the late 1800’s, bison were nearly extinct due to the westward expansion of European settlers and over hunting. Now, there is a population of merely 30,000 wild bison in North America. Although bison no longer face threats of immediate extinction, wild herds face stark realities of disease, habitat loss, and genetic degradation.