Black-tailed Gull (crassirostris) / ウミネコ / 괭이갈매기

(last update: December 2015)

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

Black-tailed Gull (crassirostris) sub-adult, February 24 2015, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.

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Clean headed. Brown tone of primaries and no obvious tips on outer primaries indicate immaturity. Note also the brown hue on some of the wing-coverts. Otherwise much similar to full adult birds. Probably this is a 4CY bird.