| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
 Home Project InfoInternational trend
 National trend
 Site characteristics
 Breeding biology
 Fecundity
 Food resources
 Nonbreeding season
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 Hybrid scores
 Ring codes
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   | Caspian Gull cachinnans  0|S 1CY-3CY, the Netherlands.Tibia  G-0|S and metal NLA 5.629.641, ringed as  pullus Larus cachinnans on May 12 2023 at De Kreupel, Holland (5247.00 N 513.00 E). 
      Ringer  Leon Kelder. Recoveries:01-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 07-06-2025 Sint Nicolaasga (Food Recycling), Friesland, NL 5.254,00 N 544,00 E colourring read Hans van Muiswinkel
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