| 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  E:V 1CY, June 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 5633845 | y-E:V | 06-6-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland Q. |  | Leon Kelder | 85,2 | 376,0 | 83,0 |  |  
          | NLA 5633845 | y-E:V | 13-6-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland Q. |  | Leon Kelder |  |  |  |  
          | NLA 5633848 | y-E:W | 06-6-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland Q. |  | Leon Kelder | 120,5 | 1085,0 | 300,5 |  |  
          | NLA 5633849 | y-E:X | 06-6-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland Q. |  | Leon Kelder | 91,2 | 627,0 | 111,0 |  |  |