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Message: <blockquote data-quote="lou salomon" data-source="post: 1726257" data-attributes="member: 16268">rainer,wing tip patterns are most conclusive usually, so for the future try to post as many pics of a problematic bird and especially pics with open wings. like peter says, the typical caspian pattern is revealed in the video. and it may be not a full adult - if that is a dark primary covert, left wing, this would be supported by the large dark mark on bill (a 4cy or 5cy).eye colour is not diagnostic at all, it just gives you a clue. actually there is hardly any diagnostic feature in large gulls as most are overlapping! like andy says, the sum of them and the weight of important ones is decisive.best whishes,</blockquote>