Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 3CY 184P December 24 2009, Wörth, Austria. Picture: Wolfgang Schweighofer.
Bird ringed as pullus in May 2007 at Jankowice Babice Malopolskie, Poland. Probably male.
A 3cy bird with white tail, bold white spots on primaries and large white mirror on P10; but also dark centres on the greater primary coverts.