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, December 10 2014, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.

Please visit Nobuo's website.

No sign of obvious tips on outer primaries which probably indicate younger adult (but angle to primaries makes this difficult to determine). Only very indistinct mottling on back of the head, overall largely clean white on head and on the underparts.