American Herring Gull (smithsonianus)

(last update: October 30, 2015)
Coordinators:
Amar Ayyash (US)
Bruce Mactavish (Canada)
Dave Brown (Canada)
Mars Muusse (Netherlands)

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American Herring Gull (smithsonianus) adult, October 28 2007, Monterey Bay, California, USA. Picture: Jeff Poklen.

See this website by Jeff, showing West coast birds mostly.

West coast bird in active moult: P10 old, active moult in rectrices. Lacking obvious immature markings. No winter streaking. Complete W-pattern on P5 and black on P4. Note short P10-tongue, on far wing from below (tongue not visible, but half of primary exposed).