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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Slaty-backed Gull (schistisagus) 4th cycle (5CY), February 18 2014, Choshi, Chiba, Japan. Picture: Shiroto.

Visit Shiroto's website for many more gull pictures from Japan!

Overall adult-like bird with some black in tail, black centres on greater primary coverts and black spot on bill. This combination probably indicate 5CY age, but advanced 4CY hard to exclude. Like adults, this bird has red gonys spot.