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Message: <blockquote data-quote="tittletattler" data-source="post: 1408360" data-attributes="member: 63151">You can call me TT.  I often get called much worse.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />I think you're probably right about this bird.  Still, I kept this bird out of the 'Dartford Gull article' because I just could not be 100% sure what it was.  I'd be interested to know how we could exclude Heuglin's (and YLG) but unfortunately I didn't note the plumage in flight and to be honest, at the time, I wasn't really sure what I should have been noting anyway.  Beautiful looking bird though.Attached is an image of a Caspian Gull found by myself and also independently by Barry Wright on the 9th Dec 07.  This is one of his shots.  This bird does show the venetian blind effect in the inner primaries and it does have a nice wing bar across the base of the greater coverts.  I suppose I'm only really happy with the ID of this bird as both of those features were present as it seems that Yellow Legged Gull and Heuglins Gull don't ordinarily show these features, perhaps.  However, I have posted shots on Birdforum of YLG which have obvious wing-bars and some do seem to have more pale webbing in the inner primaries than others.  That's the trouble with gulls!</blockquote>