#protective_covering  tough natural covering of some organisms
  supertype:  #body_covering  any covering for the body or a body part
  subtype:  #armour__armor  tough more-or-less rigid protective covering of an animal or plant
  subtype:  #scute  large bony or horny plate as on an armadillo or turtle
  subtype:  #sclerite  hard plate or element of the exoskeleton of some arthropods
  subtype:  #clypeus  a shield-like plate on the front of an insect's head

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