The North American porcupine (Erethizon dorsatum) currently occupies a wide range of terrestrial habitats across the United States and is expanding its range to include much of the North American continent (Ilse and Hellgren, 2001). It is the only porcupine in North America, and its habitat includes hemlock and deciduous forests, which often brings it into close contact with humans who have monopolized such areas for development and agriculture (Roze, 1989).