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!

Rather pale on underparts this bird. Extensive dark on tail and densely barred undertail coverts classic for Slaty-backed. Also hefty bill, head shape and small eye typical for this taxon. Dark juvenile tertials. Some upper scaps replaced for 2nd gen.