Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY 1P00 October 2013 & April 2014, The Netherlands. Photo: Fred Visscher & Capser Groenewegen.
Ringed as pullus in 2013 at Urszulin Wytyckie Lake, E Poland (51°25'N 23°12'E). In 2012 this colony only held breeding cachinnans, Urszulin Wytyckie Lake: year 2012 – 150 pairs cachinnans. (pers comm. Łukasz Bednarz), see these data.
below: cachinnans 1CY 1P00 October 26 2013, Leidschendam, The Netherlands. Photo: Capser Groenewegen.
New 2nd gen scapulars with bold patterns. Single lower scaps still juvenile. All tertials and wing-coverts still juvenile, albeit some feathers show an obviously different pattern than adjacent feathers (e.g. GC5, LLC4).
below: cachinnans 2CY 1P00 April 07 2014, Medemblik, the Netherlands. Picture: Fred Visscher.
Still streaking on head and black bill.