Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY PKAZ August 29 2011, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Yellow PKAZ and metal PLG DN-27654; ringed as pullus on May 26 2011 at Kozielno, Paczkow, S-SW Poland, (50°29' N, 16°58' E).
In this area are mixed breeding colonies (near Katowice), with far most birds breeding here are cachinnans, but in this area also records of very few michahellis from the south (e.g. ringed female from Italy) and argentatus from eastern Germany are possible (see PDF).
Will probably develop into a fine adult cachinnans, but several features slightly odd for cachinnans and in some respect better fit to juvenile michahellis.
Still head shape and bill shape nice for cachinnans.