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) 2nd cycle (2CY), October 02 2007, Isohama, Tsuri-shihama, Japan. Picture: Shigenobu Aizawa.

Please visit Aizawa's Blog for many more pictures!

Autumn second cycle bird, with 2nd gen flight feathers. Last stage of complete moult, with P9 fully grown, P10 growing. In this laste stage of the complete moult, a subsequent replacement of several wing-coverts and/or upper tertials may be started in some birds; but not here in this individual.