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 July - September

Birds in complete moult. When the old feathers with immature features will be shed, and new adult-like feathers grow in, it will become very difficult to exactly age all individuals. Therefore birds are grouped here as "sub-adults", without specific age.

 Black-tailed Gull (crassirostris) sub-adult, September 01 2015, Tokyo, Japan. Picture: Yoshihiro Ogawa.
Black-tailed Gull (crassirostris) sub-adult, August 17 2008, Brantley Lake, Eddy Co., New Mexico. Picture: Jerry Oldenettel.
Black-tailed Gull (crassirostris) sub-adult, September 04 2011, Shikotan - Kuril Islands, Sakhalin Oblast, Russia. Picture: Dmitry Kulakov.
Black-tailed Gull (crassirostris) sub-adult, August 08 2013, Hachinohe-shi, Aomori Prefecture, Japan. Picture: Shigeo T.
Black-tailed Gull (crassirostris) sub-adult, August 01 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.
Black-tailed Gull (crassirostris) sub-adult, August 19 2005, Tokyo, Japan. Picture: Trunck Wood.
Black-tailed Gull (crassirostris) 3CY, August 15 2014, Tokyo, Japan. Picture: Trunck Wood.
Black-tailed Gull (crassirostris) sub-adult, August 01 2016, Chidiwa Unzen city, Nagasaki, Japan. Picture: Nobuo Fukushima.