| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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 | Caspian Gull cachinnans  A:4 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-A:4 and metal 5.632.617, ringed as  pullus Larus cachinnans on  May 09 2025 at IJsselmeer (De Kreupel), Noord-Holland, by ringer  Leon Kelder. Recoveries:18-7-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Loeve
 Data for nest P3 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5632617 | y-A:4 | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland P. | P3 | Leon Kelder | 55,4 | 91,0 |  |  |  
          | NLA 5632618 | y-A:5 | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland P. | P3 | Leon Kelder | 52,9 | 88,0 |  |  |  
          | NLA 5632619 | y-A:6 | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland P. | P3 | Leon Kelder | 50,9 | 73,0 |  |  |    |