| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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 | Caspian Gull cachinnans  B:L 1CY, May 2025, colony De Kreupel, the Netherlands.
        
          | You can participate in this project too! 
            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Tibia Y-B:L and metal 5.633.719, ringed as  pullus Larus cachinnans on  May 16 2025 at IJsselmeer (De Kreupel), Noord-Holland, by ringer  Leon Kelder. Recoveries:13-07-2025 Andijk (Jachthaven), Noord-Holland, NL 5.244,00 N 510,00 E colourring read T. Horst, M. Muusse & N. Colpaert
 18-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Loeve
 10-09-2025 Wervershoof (Vooroever), Noord-Holland, NL 5.245,00 N 507,00 E colourring read Wim de Lange
 Data for nest C3 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5633719 | y-B:L | 16-5-2025 | Caspian Gull | pullus | 1 egg | the Netherlands, De Kreupel - eiland C. | C3 | Leon Kelder | 78,3 | 363,0 |  |  |  |