This Feb. 16, 2006 photo released by the National Park Service shows a wolf near Blacktail Pond in Yellowstone National Park.
This Feb. 16, 2006 photo released by the National Park Service shows a wolf near Blacktail Pond in Yellowstone National Park. Jim Peaco | National Park Service AP
This Feb. 16, 2006 photo released by the National Park Service shows a wolf near Blacktail Pond in Yellowstone National Park. Jim Peaco | National Park Service AP