#genus_Aythya__Aythya  canvasback; redhead; pochard; etc.
  supertype:  bird_genus  a genus of birds
  member of:  family_Anatidae
  member:  canvasback_duck__canvasback__Aythya_valisineria  North American wild duck valued for sport and food
  member:  pochard__Aythya_ferina  heavy-bodied Old World diving duck having a gray-and-black body and reddish head
  member:  Aythya_americana__redhead  North American diving duck with a gray-and-black body and reddish-brown head
  member:  scaup_duck__scaupduck__bluebill__broadbill  diving ducks of North America having a bluish-gray bill

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