Definitions for erethizon dorsatum
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Princeton's WordNet
Canada porcupine, Erethizon dorsatum(noun)
porcupine of northeastern North America with barbed spines concealed in the coarse fur; often gnaws buildings for salt and grease
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"erethizon dorsatum." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/erethizon dorsatum>.

