a porcupine feeding in a tree in alaska

north american porcupine erethizon dorsatum common mammal alaska found forested areas slope southeast panhandle peninsula kodiak nunivak lawrence islands feeding tree adult large rodent thorn pig nocturnal coniferous quillcovered hibernate america animal nature wildlife den tundra eat bark vocal clacking teeth herbivore underground burrow vegetarian front poor eyesight rapid learner good memory intelligent solitary wilderness wild aggressive nonaggressive chordata rodentia quills canada forest outdoors brown fur