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)

crassirostris rings
crassirostris PDFs

1CY July-Sept
1CY Oct-Dec

2CY Jan-March
2CY April-June
2CY July-Sept
2CY Oct-Dec

3CY Jan-March
3CY April-June
3CY July-Sept
3CY Oct-Dec

sub-ad Jan-March
sub-ad April-June
sub-ad July-Sept

adult Jan-March
adult April-June
adult July-Sept
adult Oct-Dec

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.