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, December 27 2009 - January 04 2010, Choshi, Japan. Picture: Chris Gibbins.

See Chris's BLOG.

Bulky bird. The key features are the smithsonianus-like rump and tail pattern, the rather uniform primaries (with none of the strong patterning (spots, bars) so evident in P1-5 of Vega and Herring Gulls of this age) and the uniform panel formed by the greater coverts. The underwing coverts are very uniform, softly patterned with brown.