| Adults | Immature |   
 

(Found Mainly along East coast of North America)
    

   Great Black-backed Gull
   Larus marinus
 1st Winter
 Texas City
 Texas
 11 Feb 2013
  
 by Margaret Sloan
 İMargaret Sloan

Adult in front and 2nd Winter bird on the right

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