Erethizon dorsatum

The North American Porcupine averages 3.5 feet in length, including a 6-inch tail, and can weigh up to 40 pounds. The upper body is covered with sharp quills nestled among long, thick fur ranging down the tail. The underside is covered with long, dark fur. The feet have a naked sole with 4 toes on the front feet and 5 toes on the hind feet.