| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 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 XJVU 5CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.From Germany. Now breeding in the Netherlands, at De Kreupel - island Q.  
 Data for nest Q39 - 2025. 
      
      
      
      
      
      
      
      
      
      
      
      
        | Metal    ring | Colour ring | Date | Species | Age | Clutch size | Location | Nest code | Ringer | Head+Bill | Mass | Wing | Parents |  
        | NLA 5633706 | y-B:7 | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland Q. | Q39 | Leon Kelder | 54,6 | 84,0 |  |  |  
        | NLA 5633707 | y-B:8 | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland Q. | Q39 | Leon Kelder | 63,8 | 165,0 |  |  |  
        | NLA 5633707 | y-B:8 | 04-7-2025 | Caspian Gull | pullus | -- | the Netherlands, De Kreupel - eiland Q. | Q39 | Leon Kelder |  |  |  |  
        | NLA 5633708 | y-B:9 | 16-5-2025 | Caspian Gull | pullus | 3 eggs | the Netherlands, De Kreupel - eiland Q. | Q39 | Leon Kelder | 53,1 | 78,0 |  |  |  y-B:7 has a 'cross-bill'. below:Caspian Gull cachinnans XJVU 5CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.With chick y-B:9. 
 |