Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY 3L1H September 16 2010, Mangalsala, Riga, Latvia. Picture: Igor Denisov.
Yellow 3L1H, probably ringed as pullus in 2010 in a mixed colony of Herring and Caspian Gulls in Kretuonas lake, Lithuania.
Note piano-key pattern on inner GC and strong barring on underwing.