American Herring Gull (smithsonianus)

(last update: October 30, 2015)

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

American Herring Gull (smithsonianus) adult, February 24 2008, St. John's, Newfoundland, Canada. Picture: Bruce Mactavish.

Full sub-terminal black band on P10. White innerweb on P10 end sharply, quite abrupt, not gradually (oblique). Tongue on P10 >1/2 length of the visible feather. Large mirror on P9. No obvious bayonets on P6-P8. P5 with ill-defined W-pattern.