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 November

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.

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