| 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  3|9 1CY, July 15 2023, De Kreupel, the Netherlands. Picture: Leon Kelder.Tibia  G-3|9 and metal NLA 5.623.882, ringed as  pullus Larus cachinnans on May 19 2023 at De Kreupel, Holland (5247.00 N 513.00 E). 
      Ringer  Leon Kelder. Recoveries:06-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 15-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 below: Caspian Gull cachinnans  3|9 1CY, July 15 2023, De Kreupel, the Netherlands. Picture: Leon Kelder.
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