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

(last update: December 2015)

Black-tailed Gull (crassirostris) B74 31CY, December 26 2013, Choshi, Japan. Picture: Akimichi Ariga.

Please visit Akimichi's blog.

Left leg: plastic yellow ring white code B74. No metal ring. Yellow B74 was ringed in 2009, in Kaburajima Hachinohe, Aomori Prefecture. When the ringing team trapped this bird, it had a metal ring, which proved it had been ringed as juvenile from hatch year 1983. This bird is now 30 years old (31CY). Longevity record for Black-tailed Gull is 32-year-old.

If you observe any Black-tailed Gull with yellow ring, please contact:

Hokkaido University doctoral graduate Hirata Kazuhiko
Yubinbango 041-8611 Hakodate port town 3-1-1
Hokkaido University Graduate School of Fisheries Sciences resource ecology area
Khirata < at > Fish.Hokudai.Ac.Jp

The following information is relevant:
　　1. code on the ring and the colour of the ring
　　2. observation date and time
　　3. observation location (latitude and longitude in seconds if possible)
　　4. observer name, contact information
　　5. photos