| Males | FemalesWinter malesGroupsCompared | Action | Action 2 | Action 3 |  
  

  
   Common Merganser
   Mergus merganser
 Females
 Yellowstone River
 Yellowstone National Park
 27 July 2008
     
 by Kendall Brown
 ©Kendall W. Brown
   Common Merganser
   Mergus merganser
 Female
 Airport Dike
 Provo, Utah
 10 Apr 2010
     
 by Jameson Lee
 ©Jameson Lee
   Common Merganser
   Mergus merganser
 Female
 Lake Tahoe, California
 2 Jun 2008
     
 by Kendall Brown
 ©Kendall W. Brown
   Common Merganser
   Mergus merganser
 Female
 Lake Tahoe, California
 2 Jun 2008
     
 by Kendall Brown
 ©Kendall W. Brown
   Common Merganser
   Mergus merganser
 Female
 Lake Tahoe, California
 2 Jun 2008
     
 by Kendall Brown
 ©Kendall W. Brown
   Common Merganser
   Mergus merganser
 Female
 Farmington Bay
 Davis County, Utah
 25 Jan 2007
     
 by Kent Keller
 ©Kent R. Keller
  
 Common Merganser
 Mergus merganser

 Female 
 
National Zoological Park Wetlands
 Washington D.C.
 13 Apr 1996

 by Margaret T. Sanchez
 ©Margaret T. Sanchez