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 Herring Gull (glaucescens x smithsonianus) 1st cycle (2CY), April 12 2009, Everett, Washington, USA. Picture: Steve Mlodinow.

Please visit Steve's Flickr photostream, for many more images. And also Dave Appleton's blog on hybrids!

Hybrid combo also known as "Cook Inlet Gull". By April in worn plumage.