Slaty-backed Gull (schistisagus) / オオセグロカモメ / 큰재갈매기

(last update: December 2015)

Slaty-backed Gull (schistisagus) 3rd cycle (3CY), October 17 2012, Nemuro, Hokkaido, Japan. Picture: Shiroto.

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Pale brown iris. Pale bill. Some scapulars and central GC show the adult upperpart grey tone, which is as in Lesser Black-backed Gull. Bird in last phase of complete moult, P7 fully grown, tail feathers growing. Pink legs.