2cy Caspian Gulls/2kj Pontische Meeuwen
1: © Ruud Altenburg, 18-01-09. Erasmusgracht, Amsterdam.
2-3: © Ruud Altenburg, 24-01-09; 4: © Ruud Altenburg, 22-02-09. Hoekenes, Amsterdam. Relatively dark individual. Vrij donker individu.
5-6: © Ruud Altenburg, 02-03-09. Erasmusgracht, Amsterdam.
7: © Ruud Altenburg, 20-03-09. Gulden Kruispad, Amsterdam.
8-9: © Ruud Altenburg, 23-03-09. Erasmuspark, Amsterdam. Third 2cy bird for the Erasmusgracht in 2009. Derde 2kj vogel voor de Erasmusgracht in 2009.
10-11: © Ruud Altenburg, 28-03-09. Zeeburgerkade, Amsterdam. This individual had replaced the left R1; the other R1 was missing. Dit individu had R1 links vervangen; de andere R1 ontbrak.