From FR notice, Nov. 6, 2014
"On October 6, 2014, a suspected gray wolf was seen wandering in the area of the North Rim of the Grand Canyon in Arizona. Deer hunting season is beginning in this area of Arizona, and it is believed that the wolf may be in danger of possible harm and could accidentally be shot either as a result of misunderstanding of status or misidentification. We, the U.S. Fish and Wildlife Service have, under an Endangered Species Act (ESA) permit, authorized qualified researchers to capture, draw blood, and possibly affix a brightly colored GPS radio collar on the suspect wolf and release it back into the general area where it was captured. It is essential for its safety to conduct these actions."
. . .
"Without being able to trap and identify the animal, it is unknown as to whether it is a gray wolf or some type of wolf-dog hybrid."