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

(last update: December 2015)

Slaty-backed Gull (schistisagus) 2nd cycle (3CY), March 18 2010, Nemuro, Hokkaido, Japan. Picture: Shiroto.

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Pale iris. Still dark bill. Some scapulars and MC show the adult upperpart grey tone, which is as in Lesser Black-backed Gull. Tail largely dark and pattern on wing-coverts very simple, plain pale brown with dark shaft or dark triangle centre. Pink legs.