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) 3rd cycle (4CY), March 03 2010, Shibetsu, Hokkaido, Japan. Picture: Shiroto.

Visit Shiroto's website for many more gull pictures from Japan!

Adult-like bare parts, but with much more black on the bill. 3rd gen secondaries with bold white tips. By March 3rd gen primaries can be very bleached (like in this bird) and may be misinterpreted for 2nd gen flight feathers.