| 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   T|2 1CY, July 29 2025, IJmuiden, the Netherlands. 
        
          | You can participate in this project too! 
            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Ringing details:       
  
    | Metal: | Plastic: | Date: | Sex: | Age: | Wing: | Loc: |  
    | .5641856 | G-T|2 | 29-7-2025 | F | 1CY | 413 | Strand Noordpier, IJmuiden |  |