| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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   | Caspian Gull cachinnans  2|9 1CY-3CY,  2023-2025, the Netherlands &  France. Picture: Geoffroy Chabot, Thijs Horst & Mars Muusse.Tibia  G-2|9 and metal NLA 5.623.845, ringed as  pullus Larus cachinnans on May 12 2023 at De Kreupel, Holland (5247.00 N 513.00 E). 
      Ringer  Leon Kelder. Recoveries:04-10-2023 Bayonne (Strand), Pyrénées Atlantiques, FRANKRIJK 4.329,00 N 1.239,00 W colourring read Geoffroy Chabot
 19-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 23-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
 below: Caspian Gull cachinnans  2|9 3CY,  April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.Female. 
 
 below: Caspian Gull cachinnans  2|9 1CY, October 04 2023, Bayonne, France. Picture: Geoffroy Chabot.
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