Adult Glaucous-winged Gull (Larus glaucescens) with Four Slaty-backed Gull at Akkeshi, Japan - December 2014
Local Name (Japan): Washi kamome (ワシカモメ) - "Eagle gull"
The Glaucous-winged Gull is another Herring-Gull sized species, in this instance the clear defining feature is that it's wing-tip feathers are patterned with grey rather than with black (as in Herring, Vega, Lesser Black Backed etc) or being pure white (as in Glaucous Gulls and Iceland Gulls). It is another North Pacific species, breeding from the Bering Sea to Oregon, but spreading as far as Mexico and Japan to Winter. It didn't seem especially numerous on my visit, while I don't claim to have closely examined all the large gulls I saw (of which there were many) it was definitely Slaty-backed which dominated in Hokkaido.
Subspecies: None - monotypic
- Sighting Locations -
JAPAN - Widespread Winter Migrant to Northern Japan
- TOKYO/HOKKAIDO 2014 TRIP: Single adult seen at Akkeshi associating with the more common Slaty-backed Gulls
Further Notes: RSPB, Wikipedia, BirdGuides, BirdForum Opus, Arkive, IUCN Red List