ROCKY MOUNTAIN NATIONAL PARK, Colorado — Rocky Mountain National Park officials say a recent report of a possible wolf sighting is credible, but they say it's difficult to be sure without more evidence.

Ranger Jack Dinsmoor said Friday that two experienced park volunteers reported seeing what looked like a wolf on December 4th. They didn't get a photo, but large paw prints were later found in the area.

Dinsmoor says park officials don't know if the animal was a wolf, a wolf hybrid or some other kind of mix.

Wolves were wiped out in Colorado by the 1930s, but it's believed they could migrate from Wyoming. In 2004, a dead wolf found along Interstate 70 was traced to Yellowstone National Park.