| 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
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 Future
 | Caspian Gull cachinnans  E:7 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 ? - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5633822 | y-E:7 | 30-5-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland N. |  | Leon Kelder | 103,6 | 794,0 | 218,5 |  |  
          | NLA 5633823 | y-E:8 | 30-5-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland N. |  | Leon Kelder | 65,8 | 214,0 |  |  |  
          | NLA 5633824 | y-E:9 | 30-5-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland N. |  | Leon Kelder | 63,7 | 189,0 |  |  |  |