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) adult, September 15 2009, Nemuro, Hokkaido, Japan. Picture: Hannu Huhtinen.

Active complete moult, P8-P10 old. Small mirror on innerweb of P9. Small gonys spot on pale yellow bill and iris with limited speckling. Broad tertial crescents and secondary tips worn by September (secondaries exposed as central GC have been shed). Upperparts grey tone about equal to graellsii Lesser Black-backed Gull. Pink, short-looking legs.