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) 1st cycle (1CY), December 25 2013, Rausu coastline, Hokkaido, Japan. Picture: Ian Davies.

Please visit Ian's Flickr Photostream for more pictures!

Juvenile plumage except for few upper scapulars which have been replaced for 2nd gen feathers with grey hue. Note extensive pale window on inner primaries with diffuse transitions to outerwebs, overall dark tail and densely barred uppertail coverts. Pale distal half of greater coverts.