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

(last update: December 2015)

Coordinators:
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.

Please visit Nobuo's website.

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.