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Message: <blockquote data-quote="lou salomon" data-source="post: 1638109" data-attributes="member: 16268">hi cristian,it's rather an adult bird: note the old p9 and p10 tips both with large mirrors, no hints of immature dark on alula and primary coverts. the old feathers of course have a brownish hue and lesser coverts seem to be wet - maybe that's what made you think it is a 4cy? in caspian gull adults in basic (nonbreeding) plumage often have such colourless bills with clear dark subterminal marks - more often than in michahellis.primary moult score: new p1-4 fully grown, p5 with a strong subterminal band almost grown, p6-7 missing, p8-10 old.</blockquote>