The data from the Black-headed Gull with a white colour ring on that I saw at Aberaeron harbour on the 9th of this month.
It was ringed on 14th July 2010 as a 3rd calendar year male (6M) at Harlingen, Netherlands 53o 11' N 5o 25' E, then seen on 26th August 2010 at Aberaeron by Gerard van Gool and then by myself on 9th September 2011 again at Aberaeron!
It is currently 660km west of it's original place of capture!
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