The gray wolf (also known as the Timber wolf) is the largest wild canine. Their weight ranges from 40 to 176 pounds with the average weight being 100 pounds. They are around 3 feet tall at the shoulder and are about 3 to 5 feet in length from nose to tail tip. A wolf's paw can be up to 6 inches long.

Two things that I think are most interesting about wolves are that they generally travel in single file. This eases their trek through snow. Each wolf steps in the tracks of the wolf ahead of them, creating a path - and, a wolf's howl is as unique to that wolf as fingerprints are to a human.

Some other interesting facts:
A wolf can leap 16 feet in a single bound. For short spurts, wolves can run up to 28 miles per hour over open terrain and 22 mph for approximately 2 miles. Moving at a trot, they travel 5 to 10 miles in an hour.

Wolves have incredibly good hearing and can hear sounds up to six miles away, including some high-pitched sounds that humans can't hear.

Wolves also have keen eye sight and are quick to detect the slightest movement of anything in front of them.

The pressure of a wolf jaw is twice that of a German Shepherd at 1500 pounds of pressure per square inch.

Hunger can actually enhance the wolf's sense of smell. In the right atmosphere a wolf can smell prey from up to one and half miles away.