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Dark spots appear on the head as a breeding adult molts into non-breeding plumage.

   Heermann's Gull
   Larus heermanni
 Newport, California
 19 Jul 2014
  
 by John Crawley
 ŠJohn Crawley

Dark spots appear on the head as an adult molts into non-breeding plumage.

   Heermann's Gull
   Larus heermanni
 Newport, California
 19 Jul 2014
  
 by John Crawley
 ŠJohn Crawley