The Probert Encyclopaedia of Nature

PORCUPINE

A porcupine is any rodent with quills on its body, belonging to either of two families: Old World porcupines (Hystricidae) are terrestrial in habit and have long black-and-white quills. This family includes the genus Hystrix; or New World porcupines (Erethizontidae) which are tree-dwelling, with prehensile tails and much shorter quills.
Research Porcupine