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There s a longstanding debate simmering among biologists who study porcupines. There are 16 porcupine species in Central and South America, but only one in the United States and Canada. DNA evidence suggests North America s sole porcupine belongs to a group that originated 10 million years ago, but fossils seem to tell a different story. Some paleontologists think they may have evolved just 2.5 million years ago, at the beginning of the ice ages.

United statesFlorida museum of natural historyMolly selbaJonathan blochNatashas vitekMichael granatoskyMichael zieglerNatasha vitekAtlantic oceanMitchell rieglerVictor perezRachel narducciJeanette pirloJennifer hoeflichSean moranRichard hulbert