#swan  stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult
  supertype:  #aquatic_bird__aquaticbird  wading and swimming and diving birds of either fresh or salt water
  part:  #swan's_down
  member of:  #family_Anatidae
  subtype:  #coscoroba  large white South American bird intermediate in some respects between ducks and swans
  subtype:  #cob  adult male swan
  subtype:  #pen.swan  female swan
  subtype:  #cygnet  a young swan
  subtype:  #mute_swan__Cygnus_olor  soundless Eurasian swan; commonly domesticated
  subtype:  #whooper_swan__whooperswan__whooper__Cygnus_cygnus  common Old World swan noted for its whooping call
  subtype:  #tundra_swan__Cygnus_columbianus  swan that nests in tundra regions of the New and Old Worlds
     subtype:  #whistling_swan__whistlingswan__cygnuscolumbianuscolumbianu  North American subspecies of tundra swan having a soft whistling note
     subtype:  #Bewick's_swan__Cygnus_columbianus_bewickii  Eurasian subspecies of tundra swan; smaller than the whooper
  subtype:  #trumpeter_swan__trumpeterswan__trumpeter__Cygnus_buccinator  large pure white wild swan of western North America having a sonorous cry
  subtype:  #black_swan__blackswan__Cygnus_atratus  large Australian swan having black plumage and a red bill

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