What national parks have wolves?

There are 19 national parks in the continental United States that feature gray wolves in residence: Isle Royale National Park, North Cascades National Park, Sequoia and Kings Canyon National Parks, Yellowstone National Park, Crater Lake National Park, Mount Rainier National Park, Grand Teton National Park, Great Smoky Mountains National Park, Glacier National Park, Voyageurs National Park, Olympic National Park, Denali National Park, Great Basin National Park, Rocky Mountain National Park, Hot Springs National Park, Lassen Volcanic National Park, Glacier Bay National Park, Yosemite National Park and Wrangell-St. Elias National Park.