Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 30P4 2CY, April 22 2015, Katwijk, the Netherlands. Picture: Merijn Loeve.
Red ring from Poland used in 2014. 300 pulli were ringed this year, all pulli in May 2014
at the Kozielno colony, Paczkow, Poland, ringed by Jacek Betleja.
Complete moult not started yet: P1-P10 old juvenile.