The National Park Service (NPS) will work with cooperating agencies and partners to reduce the size of the bison herd on the North Rim of Grand Canyon National Park. https://www.nps.gov/grca/learn/news/09-06-17-nps-to-reduce-bison-herd-at-grand-canyon-nat-park.htm
Source:: National Park Service to Reduce Bison Herd at Grand Canyon National Park