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adult
Western Gull
Fig 1) occidentalis . This is a freshly moulted bird with large apical spots. The clean white head and bright schoolbus yellow bill are key marks even in winter. Also, Western almost always shows the white secondary "skirt" when standing. October 28, 2011. Santa Cruz Island, California. Photo courtesy of Steve Hampton.

Fig 2) occidentalis . This bird is from the other end of the moult calendar, a worn bird at a breeding colony in late summer. Note the tattered tail, lack of apical spots (worn off), and worn coverts. August 19, 2011. Año Nuevo Island, California. Photo courtesy of Steve Hampton.






Fig 3) occidentalis . The large blob-ended bill is impressive. August 19, 2011. Año Nuevo Island, California. Photo courtesy of Steve Hampton.


Figs 4 and 5) occidentalis . These two birds show slightly different primary patterns. One has a small mirror on P9, while the other does not. February 12, 2012. Sausalito, California. Photo courtesy of Steve Hampton.


Fig 6) occidentalis . From below, the primaries and secondaries are quite dark. October 28, 2011. Santa Cruz Island, California. Photo courtesy of Steve Hampton.

Fig 7) occidentalis . Note the rather pale mantle for a "dark-mantled" gull, only a shade darker than California Gull. The light head markings and dark mark on the bill suggest possible hybridization with Glaucous-winged Gull. Photo courtesy of Don DesJardin.


Figs 8 and 9) Pale-eyed wymani. Fourth cycle. Photo courtesy of Don DesJardin.