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The third from the left is a female

   Redhead
  Aythya americana
 Skipper Bay Trail
 Utah County, Utah
 21 March 2008
      
 by Kendall Brown
 ęKendall W. Brown
   Redhead
  Aythya americana
 3 Males & a Female
 Bear River MBR
 Box Elder County, Utah
 20 Jan 2006
      
 by Ted Steinke
 ęTed Steinke
   Redhead
  Aythya americana
 3 Males & a Female
 Bear River MBR
 Box Elder County, Utah
 23 May 2005
      
 by Ted Steinke
 ęTed Steinke