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| Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Thijs Horst Leon Kelder Mars Muusse | Caspian Gull cachinnans X51C 7CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.Caspian Gull (Larus cachinnans) with yellow tarsus ring X51C from Germany. Ringed as pullus on June 01 2019. 
 below: Caspian Gull cachinnans X51C 7CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse. |