Slaty-backed Gull (schistisagus) / オオセグロカモメ / 큰재갈매기

(last update: December 2015)
Coordinators:
Kim Seog-min (South Korea)
Hideo Shimura (Japan)
Peter Adriaens (Belgium)
Mars Muusse (Netherlands)

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Slaty-backed Gull (schistisagus) 4th cycle (5CY), February 21 2014, Choshi, Chiba, Japan. Picture: Shiroto.

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

Overall adult-like bird with white tail, large mirror on P10 and adult-like upperparts. Only feature is much black on bill, probably indicating 5CY age, but advanced 4CY hard to exclude.