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 (2CY), February 19 2014, Akkeshi, Hokkaidoi, Japan.

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

Bulky bird. No scapulars replaced. Simple tertial pattern on most birds, but single notched pattern on this bird's lower tertials. Note skirt. Tail almost completely dark. Much white in GC.