It also feeds on trees like maple, birch, beech, oak, cherry, willow, pine, and fir. It loves to eat salt and has been known to chew all kinds of wood that has been touched by human hands. The main enemy of the porcupine is the fisher. It is also hunted by great horned owls, coyotes and wolves. The porcupine is a solitary animal that travels alone for most of the year.
Porcupines are most active during the night.
In winter, they like to spend time in evergreen trees where they are protected from the wind and can eat the green needles. In summer, they wander over many hectares in search of food. Their dens are located in a variety of places. These include hollow logs, caves, trees, and old buildings such as sheds and barns. The dens are not lined with soft material.