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Back, sides, and tail covered with coarse black and yellow hair and quills, weight 4.5-9 kg; infraorbital foramen larger than foramen magnum; incisors not grooved
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Body covered with fur, hair, or bristles but no quills, weight 4.5 kg or less, usually much less; infraorbital canal not as large as foramen magnum; if larger, then incisors grooved
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