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Porcupines are a spiney species of rodent which fall into the genus Erethizontidae or Hystricidae.
Old World porcupines
Old World Porcupines are any porcupine under the genus Hystricidae and are found in Africa, south Europe and India and are similar to Capybara. North African porcupines are far larger than their American cousins.
New World porcupines
New world Porcupines are any porcupine under the genus Erethizontidae and are found in the Americas and are similar to beavers.