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

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3ird winter, with adult Black-tailed Gulls

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Subadult?  This individual still has some old primaries.

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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>>