Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 5CY 4P90 January 17 2008, Fußach (Fussach), Austria. Picture: Stephen Aubry.
Green 4P90. Bird ringed as pullus on May 23 2004 at Lublin Vistula River, Poland.
Note the dark markings on the greater primary coverts. Dark iris.