Albert de Jong
Larus cachinnans 2CY PLG DN-27745 March 13 2013, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Metal ring from Poland, PLG DN-27745, cachinnans ringed as pullus on June 15 2012 in Kuznica Warezynska, near Katowice, S Poland (50°22' N, 19°11' E).
Classic bird, although venetian blind effect on innerwebs of inner primaries not very conspicious. Left wing: no coverts and no tertials included in post-juvenile moult; right wing single feathers replaced.
Below with 3CY Larus argentatus.