| Males | Females | Pairs | Compared |    
  

  
   Greater Scaup
   Aythya marila
 Barrow, Alaska
 28 Jun 2014
      
 by John Crawley
 ©John Crawley
   Greater Scaup
   Aythya marila
 Arrowhead Park, Jordan River Parkway
 Murray, Utah
 11 Mar 2013
      
 by Terry Sadler
 ©Terry Sadler

  
 Greater Scaup

 Aythya marila

 Male
 Palo Alto Bay Preserve, CA
 5 Oct 1997

 by Margaret T. Sanchez
 ©Margaret T. Sanchez