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larger North American porcupine, which has a body length of 86 cm, and weighs up to 18 kg.

They are distinguished from the Old World porcupines in that they have rooted molars, complete collar bones, entire upper lips, tuberculated soles, no trace of first front toes, and four teats.

They are less strictly nocturnal than Old World species in their habits, and some types live entirely in trees, while others have dens on the ground. Their

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