| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
 Home Project InfoInternational trend
 National trend
 Site characteristics
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 Future
 | Caspian Gull cachinnans  D:5 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 |  Data for nest M1 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5633779 | y-D:4 | 22-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M1 | Leon Kelder | 83,3 | 453,0 | 82,0 |  |  
          | NLA 5633780 | y-D:5 | 22-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M1 | Leon Kelder | 70,3 | 264,0 |  |  |  
          | NLA 5633781 | y-D:6 | 22-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M1 | Leon Kelder | 83,4 | 419,0 | 75,5 |  |  |