Albert de Jong
Larus cachinnans 2CY P325 April 20 2014, Zwolle, the Netherlands. Picture: Sander Wansing.
No data yet, but probably Green P325, ringed as pullus on May 24 2013 at Kozielno Paczkow Opolskie Poland (50°28'35" N, 16°58'54" E). This is a mixed breeding colony in Poland, with most birds breeding here cachinnans, but in this area also records of very few michahellis are possible (see PDF). P342 obviously classic cachinnans.
Perfect classic contrasting cachinnans.