| 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  W|0 1CY, August 08 2025, Fareham - Hampshire, England. Picture: Mark Francis.      
        
          | You can participate in this project too! 
            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Tibia G-W|0 and NLA 5.639.125, ringed as  pullus Larus cachinnans on May 09 2025 at IJsselmeer (De Kreupel), Noord-Holland, by ringer Leon Kelder. Recoveries:22-05-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
 08-08-2025 Fareham (Hill Head), Hampshire, ENGELAND 5.048,00 N 113,00 W colourring read Mark Francis
 Data for nest M10 - 2025. 
        
        
        
        
        
        
        
        
        
        
        
        
          | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
          | NLA 5639123 | g-W|= | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M10 | Leon Kelder | 65,5 | 187,0 |  |  |  
          | NLA 5639124 | g-W|+ | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M10 | Leon Kelder | 58,2 | 133,0 |  |  |  
          | NLA 5639125 | g-W|0 | 09-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland M. | M10 | Leon Kelder | 62,9 | 176,0 |  |  |  
          | NLA 5639125 | g-W|0 | 22-5-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland M. | M9 | Leon Kelder | 92,5 | 596,0 | 157,5 |  |  Caspian Gull cachinnans  W|0 1CY, August 08 2025, Fareham - Hampshire, England. Picture: Mark Francis.      
   |