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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Slaty-backed Gull (schistisagus) 1st cycle, February 13 2013, Rausu, Japan. Picture: Mike Buckland.

Bulky bird. Few upper scapulars replaced. Simple tertial pattern.