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) moulting into 3rd cycle (3CY), July 02 2013, Pacific Ocean, Japan. Picture: Eriko Japan.

Please visit Eriko's photostream on Flickr.

Many old brown coverts and bleach outer primaries. Bird in complete moult: P1-P4 new 3rd generation primaries (much like pattern of adults), P7-P10 old 2nd gen primaries. Tail and secondaries old 2nd gen. Note grey saddle and mature bill colour.