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   Bonaparte's Gull
   Chroicocephalus philadelphia
 Antelope Island Causeway
 Davis County, Utah
 2 Nov 2006
  
 by Paul Higgins
 İPaul Higgins

   Bonaparte's Gull
   Chroicocephalus philadelphia
 Antelope Island Causeway
 Davis County, Utah
 3 May 2012
  
 by Kendall Brown
 İKendall W. Brown

 Non-breeding adult on the left, breeding adult on the right

   Bonaparte's Gull
   Chroicocephalus philadelphia
 Antelope Island Causeway
 Davis County, Utah
 3 May 2012
  
 by Kendall Brown
 İKendall W. Brown

   Bonaparte's Gull
   Chroicocephalus philadelphia
 Starvation Reservoir
 Duchesne County, Utah
 29 Mar 2013
  
 by Ted Fitzgerald
 İTed V. Fitzgerald

   Bonaparte's Gull
   Chroicocephalus philadelphia
 Antelope Island Causeway
 Davis County, Utah
 November 2007
  
 by Ryan Houston
 İRyan Houston

   Bonaparte's Gull
   Chroicocephalus philadelphia
 Antelope Island Causeway
 Davis County, Utah
 November 2007
  
 by Ryan Houston
 İRyan Houston
  

 Bonaparte's Gull
 Chroicocephalus
               philadelphia

 Utah Lake
 Utah County, Utah
 Jul-Aug 2007

 by Lu Giddings
 İLu Giddings