3CY Caspian Gull hybrid?, Cottenham Long Drove, 30th October 2008, © Dick Newell
In many respects, this bird looks pretty good for a Caspian Gull. It has long wings, long legs, a good head-shape, slender bill, a beady eye well forward, and the typical shawl around the base of the neck of a Caspian Gull. However it has fairly bright yellow legs, a bright bill and a bill-shape that is not quite straight enough for a Caspian Gull, it droops a little in a manner similar to Yellow-legged Gull. So my guess would be that this is a hybrid Yellow-legged x Caspian Gull (RGN).
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