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) 2nd cycle (2CY), September 16 2009, Hokkaido, Japan. Picture: Hannu Huhtinen.

Active complete moult, moulting to 2nd cycle. All coverts replaced for 2nd gen, overall plain brown with only hint of vermiculated pattern, especially on central greater coverts. Limited spotting on fringes of tertials, but pale tips. P10 dropped, P1-P8 fully grwon 2nd gen. Dark iris, pale base on bill. Central secondaries still missing.