Albert de Jong
Larus cachinnans 2CY-3CY PKBB October 2012 & February 2013, Germany & the Netherlands. Picture: Armin Deutsch & Maarten van Kleinwee.
Yellow PKBB and metal PLG DN-27656; 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).
PKBB is classic cachinnans.
below: cachinnans 2CY PKBB October 08 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
First image: together with two 1st winter Herring Gulls. Last acquired lower scapulars are almost completely greyish, just with a dark shaft streak.
below: cachinnans 3CY PKBB February 08 2013, Barneveld, the Netherlands. Picture: Maarten van Kleinwee.
Note small mirror on 2nd gen P10. Complete row of MC replaced again in partial autumn moult.