Federal wildlife officials say tests have confirmed that the animal seen on the North Rim of the Grand Canyon recently is a female gray wolf.
The wolf traveled 450 miles or more from its habitat in the northern Rocky Mountains, and it was identified from analysis of its droppings.
It was first seen in the North Rim earlier this month. The U.S. Fish and Wildlife then announced it was working on determining whether the animal was in fact a gray wolf or a hybrid.
A gray wolf hadn't been seen in Arizona for more than 70 years.
The animal is fully protected under the Endangered Species Act.