A gray wolf was recently photographed on the north rim of the Grand Canyon in Arizona in what would be the first wolf sighting in the national park since the last one was killed there in the 1940s, conservation groups said on Thursday.

The U.S. Fish and Wildlife Service was sending a team to try to capture the animal in question in order to verify the sighting.

Several photos of the animal were taken over the weekend by a Grand Canyon park visitor who shared them with conservation activists and park staff, according to the Center for Biological Diversity, which made the findings public.