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

(last update: December 2015)

Slaty-backed Gull (schistisagus) 3rd cycle (4CY), March 13 2010, Nemuro, Hokkaido, Japan. Picture: Shiroto.

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In spring underparts and head start to become white, still with some markings in March. 3rd gen flight feathers and normally several immature features: dark centres on primary coverts, small tips on outer primaries, brown wash on several coverts. Often mirror on P10 and some black in the tail.