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 (1CY), October 17 2009, Tsuri-shihama, Japan. Picture: Shigenobu Aizawa.

Please visit Aizawa's Blog for many more pictures!

Overall brown texture on underparts, extensive dark on tail. Also hefty bill, head shape and small eye typical for this taxon. Dark juvenile tertials. Some upper scaps replaced for 2nd gen. With adult.