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), May 14 2014, Choshi, Chiba, Japan. Picture: Shiroto.

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

Immature looking bird, mostly due to wear. As the greater coverts are very worn, the secondaries underneath are exposed showing their pattern: bold white tips and grey centres. This is typically the pattern on 3rd gen secondaries making this bird most probably 3rd cycle. Otherwise retarded plumage with much brown tones, also in primaries. Bicoloured bill.