| Coordinators: Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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 |  Caspian Gull cachinnans 4.5 2CY-3CY, 2024-2025, colony De Kreupel, the Netherlands.  Picture: Thijs Horst & Mars Muusse.Red  tibia  ring r[4.5] and metal NLA 5.629.604, ringed as pullus Larus cachinnans on April 29 2023 at De Kreupel, Holland (5247.00 N 513.00 E) - ringer Leon Kelder. Recoveries:12-05-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
 25-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 28-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
 19-06-2025 Oostknollendam (De Marken), Noord-Holland, NL 5.230,00 N 449,00 E colourring read Kees Floris
 29-06-2025 Jisp (Het Zwet), Noord-Holland, NL 5.230,00 N 449,00 E colourring read Kees Floris
 13-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & N. Colpaert
 26-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Thijs Horst
 below: Caspian Gull cachinnans 4.5 3CY,  July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
 below: Caspian Gull cachinnans 4.5 2CY, July 28 2024, colony De Kreupel, the Netherlands.  Picture: Thijs Horst & Mars Muusse.
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