Slaty-backed Gull  Larus schistisagus
Oct. 15th 2004 Tamagawa-river Kawasaki Kanagawa Japan


3ird winter, with adult Black-tailed Gulls





Subadult?  This individual still has some old primaries.



Adult winter.


Note that the P10 and P9 is growig on the underside of the wings.

Standing shots of juv-1w on the same date>>
Flight shots of juv-1w on the same date>>