Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans 1CY FF December 24 2011 2011, Leiden, the Netherlands. Picture: Maarten van Kleinwee.
Tibia yellow FF and metal Arnhem 5463250.
Some of the identification features of a first-calendar year Caspian Gull, distinguishing it from a European Herring Gull or a Yellow-legged Gull of the same age include: