CBS Colorado: Bison population, with Yellowstone National Park roots, explodes in Colorado
VIDEO: In 2015 researchers at Colorado State University, in conjunction with the City of Fort Collins and Larimer County, released a small herd of bison onto the 2,700-acre Soapstone Prairie north of Fort Collins. The herd originally included just 10 bison, but thanks to advanced assisted reproductive technologies at CSU, the herd has grown significantly and has been kept as close to genetically pure as possible and free of brucellosis.