| Adults | Immature |   
 

(Found Mainly along East coast of North America)
    

   Great Black-backed Gull
   Larus marinus
 Cape Cod
 Massachusetts
 3 Feb 2014
  
 by Merrill Webb
 İMerrill Webb
   Great Black-backed Gull
   Larus marinus
 Hyannisport
 Massachusetts
 27 June 2012
  
 by Kendall Brown
 İKendall W. Brown
   Great Black-backed Gull
   Larus marinus
 Hyannisport
 Massachusetts
 27 June 2012
  
 by Kendall Brown
 İKendall W. Brown