Gray wolf | Smithsonian’s National Zoo and Conservation Biology Institute https://nationalzoo.si.edu/animals/gray-wolf
The gray wolf, also called the timber wolf, is the largest member of the canine family with fur ranging from gray to brown, black or white. Packs of gray wolves hunt at night, using their speed, sharp teeth and claws to catch caribou, moose, deer, bison, beavers, rabbits and fish.
These tunnels, or maternity dens, are one of the only ways wolves will seek shelter