Lesser Black-backed Gull graellsii HKAX 3CY, May 11 2010, Zeebrugge, Belgium. Picture: Peter Adriaens.
Ringed as pullus in July 2008 at Zeebrugge, Belgium.
Advanced moult on the wintering grounds, but primaries still old 2ndf gen, brown. Secondaries and tail replaced for 3rd gen.
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