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Message: <blockquote data-quote="smiths" data-source="post: 1726117" data-attributes="member: 4346">I would identify both birds as Caspian Gulls.If you check the video clip frame by frame, the underside of P10 becomes visible, and shows the typical Caspian pattern: black is very much restricted to the outer web, except for the medial band. In Herring Gull, the black colour usually bleeds onto the inner web, even in birds with very long grey tongue.However, I agree that the structure of this bird does not look entirely typical (short primary projection, short legs, bulky body). It is probably not enough reason to call it a hybrid though.</blockquote>