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), April 17 2012, Gloucester, Massachusetts. Picture: Keith Mueller.

Bird showing many obvious immature markings in tail, primary coverts and wing-coverts. However, this is combined with adult-like grey inner primaries and a sharply demarcated mirror on P10. Note intense black centres on secondaries.