What does porcupines eat and what's their lifezone?

Porcupines are Herbavores. They eat vegetation. Mostly Bark, and pulp of trees, leaves, nuts, berries. They are very sucessful animals and can be found in most contients, around the world. North and South America, Africa, Europe and many other places. There are many species and sub-species. If you pinpointed one type of Porcupine someone could better tell you the lifezone or habitat if thats what you ment.