Coordinators:
Alvaro Jaramillo
John Cant
Mars Muusse
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Western Gull occidentalis adult, August 22 2011, Berkeley, California, USA. Picture: John Cant.
Adult with mirror on P10 only, no black in tail and no immature markings on underwing nor on the secondaries. White head, pink legs, orange-yellow orbital ring, red only on lower mandible. Amber coloured iris. Complete moult: P5 fully grown, P6 growing, P8-P10 old.
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glaucescens Glaucous-winged Gull & Western Gull occidentalis