Bison are a keystone species that shape the prairie ecosystem through their grazing and wallowing. That’s why Bob Hamilton, a researcher with The Nature Conservancy, calls them the “kings of the prairie.”

Conservationists began to reintroduce bison in Oklahoma’s Joseph H. WIlliams Tallgrass Prairie Preserve in 1993, making it one of the best places in the world to see the bison’s biodiversity impact in action.