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) 1st cycle / 1CY September

Birds still in fresh juvenile plumage. Later in this month, some advanced birds (early hatched?) may start moult in the upper scapulars, but completely juvenile plumage is the norm.

 Slaty-backed Gull (schistisagus) 1st cycle (1CY), September 15 2009, Nemuro, Hokkaido, Japan. Picture: Hannu Huhtinen.
Slaty-backed Gull (schistisagus) 1st cycle (1CY), September 16 2009, Hokkaido, Japan. Picture: Hannu Huhtinen.
Slaty-backed Gull (schistisagus) 1st cycle (1CY), September 16 2009, Hokkaido, Japan. Picture: Hannu Huhtinen.