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) adult, September 16 2009, Hokkaido, Japan. Picture: Hannu Huhtinen.

Active complete moult, P1-P6 replaced, P9-P10 old. No mirror on P9. Small gonys spot on pale yellow bill and iris with limited speckling. Broad tertial crescents and secondary tips worn by September. Upperparts grey tone about equal to graellsii Lesser Black-backed Gull. Pink, short-looking legs.