American Herring Gull (smithsonianus)

(last update: October 30, 2015)

Coordinators:
Amar Ayyash (US)
Bruce Mactavish (Canada)
Dave Brown (Canada)
Mars Muusse (Netherlands)

American Herring Gull (smithsonianus) sub-adult, November 05 2011, Chicago IL, USA. Picture: Amar Ayyash.

Black centres on greater primary coverts indicate near-adult. Complete moult in last phase with growing outer primaries and inner secondaries..