| There is little to suspect that this is not a pure Caspian Gull, apart from a slightly angular gonys. However, it was ringed (4P60 green) at Wloclawek Reservoir, Vistula River, Poland, 52:39'N, 19:08'E on 9th May 2004 where it was determined that its mother was cachinnans but its father was argentatus. However, the bird was seen again at Dumpiai, Klaipeda, Lithuania by Hannu Koskinen and Visa Rauste on 10th September 2008 See here . It now looks more like a rather odd Herring Gull with some cachinnans features.
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Caspian Gull 2CY 20 May
Caspian Gulls - UK
