American Herring Gull (smithsonianus)

(last update: October 30, 2015)

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

Slaty-backed Gull (schistisagus) 2nd cycle (2CY), September 16 2009, Hokkaido, Japan. Picture: Hannu Huhtinen.

Active complete moult, moulting to 2nd cycle. All coverts and tertials replaced for 2nd gen, overall plain greyish brown with no hint of vermiculated pattern. New scapulars show the upperpart grey tone of adults, older scapulars bleached to whitish, with dark shaft.