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) 3rd cycle (4CY), March 18 2010, Nemuro, Hokkaido, Japan. Picture: Shiroto.

Visit Shiroto's website for many more gull pictures from Japan!

In spring underparts and head start to become white, still with some markings in March. 3rd gen flight feathers and normally several immature features: dark centres on primary coverts, small tips on outer primaries, brown wash on several coverts. Often mirror on P10 and some black in the tail.