Yellowstone National Park (in English). National Parks Service. August 9, 2006. Archived from the original on October 13, 2007. Consulted on April 1, 2007.

↑ Prettyman, Brett (January 10, 2008). «Moving Bison». Salt Lake Tribune (in English). Archived from the original on April 8, 2008. Consulted on January 12, 2008.

↑ «A Yellowstone Chronology» (in English). Defenders of Wildlife. Archived from the original on June 7, 2007. Consulted on March 19, 2007.

↑ «Final Rule Designating The Northern Rocky Mountain Population of Gray Wolf AS A Distinct Population Segment and Removing This Distinct Population Segment from The Federal List of Endangered and Threatened Wildlife» (in English). Fishing and wildlife service. February 27, 2008. Archived from the original on January 21, 2009. Consulted on June 11, 2008.

↑ «Black Bears» (in English). Service of National Parks. March 31, 2014. Archived from the original on April 18, 2014. Consulted on April 16, 2014.

↑ «Black Bear Information Continued». Yellowstone National Park (in English). National Parks Service. April 3, 2014. Archived from the original on April 18, 2014. Consulted on April 16, 2014.

↑ Frank T. Van Manen, Mark A. Haroldon, and Bryn E. Karabensh (2018). «Yellowstone Grizzly Bear Investigations 2017: Annual Report of the Interagency Grizzly Bear Study Team» (PDF) (in English). United States Geological Service, Wyoming Hunting and Fisheries Department, National Parks Service, United States Fisheries and Wildlife Service, Parks, Wild Visa and Montana Fisheries; Forest service of the United States, and department of hunting and fishing of North Tribal Arapaho and this shoshon. Archived from the original on December 18, 2018. Consulted on December 19, 2018.

↑ «Grizzly Bears». Yellowstone National Park (in English). National Parks Service. April 2, 2018. Archived from the original on October 10, 2018. Consulted on December 19, 2018.

↑ A B «Grizzly Bears & The Endangered Species ACT». Yellowstone National Park (in English). National Parks Service. October 5, 2018. Archived from the original on October 13, 2018. Consulted on December 19, 2018.

↑ Mott, Maryann (July 2, 2004). «Bald Eagle, Grizzly: U.S