Albert de Jong
Larus cachinnans 1CY & 3CY PEZV December 2011 & January 2013, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Yellow PEZV and metal PLG DN-27134; ringed as pullus on May 24 2011 at Zwirownia Zakole A, Jankowice - Babice, Poland (50,02N 19,28E). Zwirownia = gravel pit, this colony is situated between the towns of Babice and Jankowice in a gravel pit.
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). PEZV is classic cachinnans.
below: cachinnans 1CY PEZV December 29 2011, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Tertials with sharp white tips, much white in tail, but in general straightforward cachinnans. Last new scaps appear plain grey, several coverts replaced as well. Inner primaries rather pale overall. White head sharply demarcated by boa in hindneck.
below: with green ringed argentatus from Germany.
below: cachinnans 3CY PEZV January 10 2013, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Bird in the background. Note mirror on 2nd gen P10.