#fluke  either of the two lobes of the tail of a cetacean
  supertype:  tail  the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body
  part of:  cetacean_mammal__cetacean__blower  large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals

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