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 basic moult / 2CY July

Birds in their first complete moult, replacing all flight feathers for 2nd generation. Old juvenile feathers heavily worn and often bleached to white, leaving just the (stronger) shaft.

 Slaty-backed Gull (schistisagus) 2nd cycle (2CY), July 12 2004, Chukotka, Russian Federation. Picture: Tuomo Jaakkonen.
Slaty-backed Gull (schistisagus) 2nd cycle (2CY), July 12 2004, Chukotka, Russian Federation. Picture: Tuomo Jaakkonen.
Slaty-backed Gull (schistisagus) 2nd cycle (2CY), July 12 2004, Chukotka, Russian Federation. Picture: Tuomo Jaakkonen.