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) 3rd cycle (3CY), December 25 2013, Shibetsu Harbor, Shibetsu, Hokkaido, Japan. Picture: Ian Davies.

Please visit Ian's Flickr Photostream for more pictures!

Black in tail, in combination with adult-like primaries (albeit with small tips) and adult-like upperparts. Extensive head streaking and much black on bill. Note brown, immature coverts. Pink orbital ring.