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)

Slaty-backed Gull (schistisagus) 3rd cycle (4CY), February 19 2014, Akkeshi, Hokkaidoi, Japan.

See abcdefgewings's Flickr photostream for more pictures from Japan.

Much black on bill and many immature coverts. Still with black in tail. Adult-like central primaries and mirror on P10.