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)

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.