Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 2CY PKDE February 2012, Switzerland. Picture: Ernst Weiss.
Yellow PKDE and metal PLG DN-27691; ringed as pullus on May 26 2011 at Kozielno, Paczkow, S-SW Poland, (50°29' N, 16°58' E).
Checkered covert pattern, reminiscent of Herring Gull and very barred 2nd gen scapulars.