| 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  B:U 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 C16 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5633726 | y-B:U | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C16 | Leon Kelder | 55,7 | 108,0 |  |  |  
          | NLA 5633727 | y-B:V | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C16 | Leon Kelder | 62,4 | 177,0 |  |  |  
          | NLA 5633728 | y-B:W | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C16 | Leon Kelder | 64,9 | 176,0 |  |  |  |