All scapulars and mantle feathers are moulted to second generation, all tertials are still juvenile, some lesser coverts and also few inner median covert are second generation
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Note the rather worn white tertial fringes, the white primary tips start to turn brownish
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Note the "apical spots" on p2-p4, in comparison to 1cy Caspian Gulls
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The under-wings are dark showing a typical fine dark marked pattern
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Note the typical tapering solid black tail-band; the rectrices are clearly white from the top of the tail-band till the base of these feathers with only a few dark spots
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