#scale.natural_covering  a flattened rigid plate forming part of the body covering of many animals
  supertype:  #natural_covering__naturalcovering__covering__cover  a natural object that covers or envelops; "the fox was flushed from its cover"
  subtype:  #fish_scale  scale of the kind that covers the bodies of fish
  subtype:  #squama  a protective structure resembling a scale
     subtype:  #alula__calypter  scale-like structure between the base of the wing and the halter of a two-winged fly

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