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) 2nd pre-basic moult / 2CY July - September

Birds in complete moult, including moult of all flight feathers (2nd pre-basic moult). After this moult period, birds will be in 2nd basic plumage (2nd cycle birds).

 Black-tailed Gull (crassirostris) 2CY, July 05 2014, Matsuhama - Niigata, Japan. Picture: Masayuki Kurose.
Black-tailed Gull (crassirostris) moulting into 2nd cycle (2CY), July 22 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.
Black-tailed Gull (crassirostris) moulting into 2nd cycle (2CY), July 22 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.
Black-tailed Gull (crassirostris) moulting into 2nd cycle (2CY), July 13 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.