Albert de Jong
Larus cachinnans 3CY PLG DN-20642 December 23-24 2009, Wörth, Austria. Picture: Wolfgang Schweighofer.
Most likely one of Tomasz Iciek´s birds from western Poland: ringed as pullus on June 01 2007 at Radyczyny Turek Poland (52.00N, 16.67E). Probably female.
A 3cy bird with white tail, bold white spots on primaries and large white mirror on P10; but also some brown lesser coverts.
below: DN-20642 left bird.