#pod  a group of aquatic mammals
  supertype:  #animal_group  a group of animals
  member:  #cetacean_mammal__cetacean__blower  large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals
  member:  #pinniped_mammal__pinniped__pinnatiped  aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers

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