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

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Juv./1st winter

Same individual as above

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Juv/1st winter. female-type, small individual

Same individual as above

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Juvenile

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juv/1w

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2nd winter

Same individual as above

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3rd to adult winter on the samedate>>
Flight shots of juv-1w on the same date>>