I was in San Diego, California, USA, last week for a short business trip during which I of course took the opportunity to visit the local Western Gulls Larus occidentalis.
All photos were taken between 13 April and 17 April 2014.
4th-calendar year types
As adult, but with brown hue on the wing coverts and black markings on the alula and greater primary coverts. One individual also showed black markings in the tail.