on the species. The young are born fully developed, with open eyes, and are able to climb trees within a few days of birth.

Genera and species

They include three genera, of which the first is represented by the North American porcupine (Erethizon dorsatum), a stout, heavily built animal, with long hairs almost or quite hiding its spines, four front and five hind toes, and a short, stumpy tail. It is a native of the greater part of Canada and the United States,

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