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
sub-ad Oct-Dec

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

Black-tailed Gull (crassirostris) 4th basic moult / 4CY October - December

Birds at the end of the complete moult. When birds are lacking any old feathers with immature features, it will become very difficult to exactly age all individuals.

Black-tailed Gull (crassirostris) sub-adult, October 12 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.
Black-tailed Gull (crassirostris) sub-adult, October 11 2015, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.
Black-tailed Gull (crassirostris) sub-adult, December 10 2014, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.