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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hybrid Glaucous-winged x Western Gull (glaucescens x occidentalis) adult, December 07 2015, Eureka waterfront, CA. Picture: E Fox.

Please visit Fox's Flickr photostream, for many more images.

This basic adult bears most resemblance to Western Gull, but with much smudge on the head.