#caudal_fin__tail_fin  the tail of fishes and some other aquatic vertebrates
  supertype:  #fin  organ of locomotion and balance in fishes and some other aquatic animals
  subtype: {#heterocercal_fin #homocercal_fin}
  part of:  #fish  any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

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