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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American Herring Gull (smithsonianus) 3rd cycle (4CY), February 20 2013, Stratford, CT, USA. Picture: Donna Rae Henault Caporaso.

Aged by adult-like inner primaries in combination with many immature marking (barred GC, much black in tail, dark centred secondaries).