Black-tailed Gull (crassirostris) / ウミネコ / 괭이갈매기

(last update: December 2015)

Kim Seog-min (South Korea)
Hideo Shimura (Japan)
Peter Adriaens (Belgium)
Mars Muusse (Netherlands)

Black-tailed Gull (crassirostris) sub-adult, September 01 2015, Tokyo, Japan. Picture: Yoshihiro Ogawa.

Please visit Yoshihiro's photostream on Flickr.

Bird in last stage of the complete moult with outer primary P10 still old. P7 > P6. P7 wiith bold white tip. Note brown unmoulted lower tertial, indicating immaturity.