North American Porcupine Quills
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The North American porcupine ( Erethizon dorsatum ), also known as the Canadian porcupine or common porcupine , is a large rodent in the New World porcupine family. The beaver is the only rodent in North America that is larger than the North American porcupine. The porcupine is a caviomorph rodent whose ancestors rafted across the Atlantic from Africa to Brazil over 30 million years ago [ citation needed ] , and then migrated to North America during the Great American Interchange after the Isthmus of Panama rose 3 million years ago.