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) 1cy, October 08 2006, St. John's, Newfoundland, Canada. Picture: Bruce Mactavish.

Birdwith replaced scpaulars by early-Ocober, upper scapulars = 75-99%, lower scapulars = 1-25%, total scapulars = 25-50%. Note the pale base of the bill, uniform under-parts and neck (not blochy or streaked, but uniform "smoky"), dark greater covert bar and densely patterned undertail coverts. Limited white on the very outer-web of R6.