Out of the cold

source: imgur
https://www.youtube.com/watch?v=3Vwq-mOjaas&feature=youtu.be
  • An adult North American porcupine (Erethizon dorsatum) has about 30,000 quills that cover almost all of its body. The quills are hollow and used primarily for defense, but also serve to insulate their bodies during winter. They cannot throw their quills

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