Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1P67 sub-adult, May 19 2013, Wytyckie Lake - Urszulin, Poland. Picture: Łukasz Bednarz ringing team.
For 2012, breeding location of 150 pairs cachinnans, of which 54 adults ringed and 158 pulli in 2012 (pers comm. Łukasz Bednarz).
Breeding bird trapped at the nest. Sub-adult, with obvious immature markings on many coverts and secondary centres, probably 4CY.