| Adult | Immature |    
  

   Thayer's Gull
   Larus thayeri

  1st Winter
 Lee Kay Pond
 Salt Lake County, Utah
 December 2006
     		 by Tim Avery
 ŠTim Avery

   Thayer's Gull
   Larus thayeri

  2nd Winter
 Lee Kay Pond
 Salt Lake County, Utah
 December 2006
     		 by Tim Avery
 ŠTim Avery

   Thayer's Gull
   Larus thayeri

  2nd Winter
 Bountiful Landfill
 Davis County, Utah
 January 2006
     		 by Tim Avery
 ŠTim Avery