Author 'Ninik' (Id 242142 ) : With its long claws, and his sense of balance, the porcupine north american porcupine arboreal of Canada (Erethizon dorsata) is a good climber. His back and tail are covered by more than 30 000, long-haired and hard quills that may be planted in the skin of an opponent, but he prefers to avoid confrontation. He is a vegetarian.