By 1908, Denver Zoo’s 18 American bison were all that remained in Colorado. In our first official field conservation effort, the Zoo partnered with Yellowstone National Park officials and others to help propagate the endangered species. In 1914, the growing conservation herd was restored to Genesee Park and placed under the care of Denver Mountain Parks. Denver Zoo continues to work with DMP on bison conservation, prairie restoration and cultural reconciliation—and since 2021, we have worked with the City of Denver to Donate 47 bison to Native American communities as a form of reparations.