| 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
 Food resources
 Nonbreeding season
 Breeding species
 Hybrid scores
 Ring codes
 Future
 | Caspian Gull cachinnans  B:S 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 C6 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5633723 | y-B:R | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C6 | Leon Kelder | 69,2 | 161,0 |  |  |  
          | NLA 5633724 | y-B:S | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C6 | Leon Kelder | 70,0 | 231,0 |  |  |  
          | NLA 5633725 | y-B:T | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland C. | C6 | Leon Kelder | 62,9 | 161,0 |  |  |  |