Assertion: hedgehog's back | /r/HasProperty | covered with quill
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Source sentences:
text: Searching Google Books, I have found references for a few hedgehog species explicitly stating that they have quills on their head (of course always meaning part of their head, excluding snout, eyes, etc.): "The African pygmy hedgehog's back is covered with quills, beginning at the brow or crown of the head, just in front of the ears and extending down the entire back and down the sides of the animal's body.