#subfamily_Sterninae__subfamilysterninae__Sterninae  terns
  supertype:  bird_family  a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
  member of:  family_Laridae
  member:  tern  small slender gull having narrow wings and a forked tail
  member:  genus_Sterna__Sterna  a genus of Sterninae
     member:  sea_swallow__seaswallow__Sterna_hirundo  common tern of Eurasia and America having white black and gray plumage

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