Kæledyr Liv
Der er 19 nationalparker i det kontinentale USA, der har grå ulve i bopæl:Isle Royale National Park, North Cascades National Park, Sequoia og Kings Canyon National Parks, Yellowstone National Park, Crater Lake National Park, Mount Rainier National Park, Grand Teton National Park, Great Smoky Mountain Park, Glacier National Park, Voyageursurs National Park, Olympic National Park, Hot Springs National Park, Lassen Volcanic National Park, Glacier Bay National Park, Yosemite National Park og Wrangell-St. Elias National Park.