(Found Mainly along East coast of North America)   

| Adults | Immature | flying |   
 

    

   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

   Great Black-backed Gull
   Larus marinus
 Cape Cod
 Massachusetts
 3 Feb 2014
  
 by Merrill Webb
 İMerrill Webb