Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 2CY PKPL February 11 2013, Lake of Constance - Steinach, Switzerland. Picture: Stephan Trösch.
Yellow PKPL, ringed as pullus on May 25 2012 at Kozielno Paczkow Opolskie, Poland (50,48333N 16,96667E).
Upper tertials and inner coverts replaced in post-juvenile moult.