#genus_Cygnus__Cygnus  a genus of Anatidae
  supertype:  #bird_genus  a genus of birds
  member of:  #family_Anatidae
  member:  #mute_swan__Cygnus_olor  soundless Eurasian swan; commonly domesticated
  member:  #whooper_swan__whooperswan__whooper__Cygnus_cygnus  common Old World swan noted for its whooping call
  member:  #tundra_swan__Cygnus_columbianus  swan that nests in tundra regions of the New and Old Worlds
  member:  #trumpeter_swan__trumpeterswan__trumpeter__Cygnus_buccinator  large pure white wild swan of western North America having a sonorous cry
  member:  #black_swan__blackswan__Cygnus_atratus  large Australian swan having black plumage and a red bill

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