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) 4th cycle (4CY), October 02 2007, Isohama, Tsuri-shihama, Japan. Picture: Shigenobu Aizawa.

Please visit Aizawa's Blog for many more pictures!

Last stage of complete moult, with P7 fully grown, P8-P9 growing and P10 still old 3rd gen (white mirror). Note broad white trailing edge on the old secondaries, exposed now the central GC are dropped. Pale iris.