North American Porcupines have over 30,000 quills each! Other species of porcupine also have an impressive number of quills and these can be as dense as 150 quills per square inch.
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North American Porcupines have over 30,000 quills each! Other species of porcupine also have an impressive number of quills and these can be as dense as 150 quills per square inch.