Gull Research Organisation

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) 3rd cycle / 3CY October - December* Birds in 3rd cycle plumage, after a subsequent partial autumn moult. The tail-feathers will get white tips now, and the bill looks more adult-like. Still, quite obvious brown on wing-coverts and no white tips on outer primaries.	Black-tailed Gull (crassirostris) 3rd cycle (3CY), October 24 2010, Bangpu Samutprakan, Thailand. Picture: Somchai Kanchanasut.