Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY & 4CY PNED December 2013 & February 2016, Katwijk aan Zee & Barneveld, the Netherlands.
Yellow PNED, ringed as pullus on May 24 2013 at Kozielno, Paczkow, S-SW Poland, (50°28' N, 16°58' E).
below: Larus cachinnans 4CY PNED February 03 2016, Barneveld, the Netherlands. Picture: Herman Bouman.
below: Larus cachinnans 1CY PNED December 02 2013, Katwijk aan Zee, the Netherlands.
Single coverts but tertials replaced. In large group of gulls (5.000+) on the beach.