Slaty-backed Gull (schistisagus) / オオセグロカモメ / 큰재갈매기

(last update: December 2015)

Kim Seog-min (South Korea)
Hideo Shimura (Japan)
Peter Adriaens (Belgium)
Mars Muusse (Netherlands)

hybrid Glaucous-winged x Western Gull (glaucescens x occidentalis) adult, October 28 2011, Elwha River Mouth, Clallam County - Washington, USA. Picture: Steve Mlodinow.

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

This hybrid combination may show pigmentation on the wing-tips being more extensive and a tad darker than on a pure Glaucous-winged Gull. It can show head and neck markings of a basic plumaged Glaucous-winged Gull but a mantle color that is more Western-like. The bird below is somewhat like Western Gull, but Steve points to the dark eye and heavy markings on the head and chest. Western Gulls should be white headed/chested, or nearly so. Many/most have pale eyes, though this is highly variable.