#family_Balaenopteridae__Balaenopteridae  rorquals; blue whales
  supertype:  #mammal_family  a family of mammals
  member of:  #suborder_Mysticeti
  member:  #rorqual__razorback  any of several baleen whales of of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin
  member:  #genus_Balaenoptera__Balaenoptera  type genus of the Balaenopteridae
     member:  #blue_whale__sulfur_bottom__Balaenoptera_musculus  largest mammal ever known; bluish-gray migratory whalebone whale mostly of southern hemisphere
     member:  #finback_whale__finbackwhale__finback__finwhale__common_rorqual__Balaenoptera_physalus  large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific
     member:  #sei_whale__seiwhale__Balaenoptera_borealis  similar to but smaller than the finback whale
     member:  #lesser_rorqual__piked_whale__pikedwhale__minke_whale__minkewhale__Balaenoptera_acutorostrata  small finback of coastal waters of Atlantic and Pacific
  member:  #genus_Megaptera__Megaptera  humpback whales
     member:  #humpback_whale__humpback__Megaptera_novaeangliae  large whalebone whale with long flippers noted for arching or humping its back as it dives

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