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) adult, February 24 2008, St. John's, Newfoundland, Canada. Picture: Bruce Mactavish.

White innerweb on P10 end in 90 degrees angle, quite abrupt, not gradually (oblique). Relatively short tongue on P10 (normally on average longer for this taxon); tongue on P10 about 1/2 length of the visible feather. Sub-terminal black band on P10 broken in the centre. Medial band on P10 broader than mirror on P10. Mirror on P9 on both webs. Difficult bird in a W European context.