Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY PLBV December 28 2012, Sonzay Indre-et-Loire, France. Picture: Patrick Derrien.
Yellow PLBV and metal PLG DN-28825, ringed as pullus on May 25 2012, at Kozielno, Paczkow, S-SW Poland, (50°28' N, 16°58' E).
Angle of this bird relative to the observer gives limited insight in exact covert & tertial moult. Note typical head shape and parallel bill.