Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY & 3CY PANX August & October 2009, Windheim - Minden, Germany & December 2012, Herstal - Liege, Belgium.
Yellow ring from Poland. Ringed as pullus yellow PANX & metal PLG DN-26263 on May 21 2009 at Jankowice - Babice, S. Poland (50°02'N, 19°28'E).
below: cachinnans 1CY PANX August 28 2009, Windheim - Minden, Germany (52°24'50N, 09°01'49E). Picture: Armin Deutsch.
Cachinnans and argentatus in August: note differences in structure and coloration.
below: cachinnans 1CY PANX October 28 2009, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.
Classic bird: white-headed and last replaced scpaulars (LLS) appear plain grey.
Larus cachinnans 3CY PANX December 27 2011, Herstal - Liege, Belgium. Picture: Peter Adriaens.
Perfect illustrative bird to show the "fast development" of patterns in feather groups: only 3rd cyle / 3rd winter bird with adult-like primaries (although much more black in wingtip than in full aduls, but already clear-cut divisions), almost completely adult-like row of secondaries, limited markings on greater covert centres, tertials and wing-coverts in the carpal edge.