#quill  a stiff hollow protective spine on a porcupine or hedgehog
  supertype:  spine  a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin
  part of:  hedgehog__Erinaceus_europaeus__Erinaceus_europeaeus  small nocturnal Old World mammal covered with both hair and protective spines
  part of:  porcupine__hedgehog  relatively large rodents with sharp erectile bristles mingled with the fur

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