| 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 hybrid H|X 1CY, August 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst.
        
          | You can participate in this project too! 
            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Tibia  G-H|X and metal NLA 5.629.325, ringed as  pullus Larus cachinnans on May 24 2024 at De Kreupel, Holland (5247.00 N 513.00 E). 
        Ringer  Leon Kelder.  Recoveries:05-08-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & T. Muusse
 31-05-2025 Oostknollendam (De Marken), Noord-Holland, NL 5.230,00 N 449,00 E colourring read Kees Floris
 Nest data 2024: 
  
  
  
  
  
  
  
  
  
  
  
  
  
    | Date trapped: | Metal code | ... | Tibia: | Colour: | Species: | Age: | Status | Clutch size: | Location: | Fledged: | Nest code: |  
    | 24-5-2024 | ...5629323 | 1 | H|V | Green | 5927 | 1 | - | 3 | IJsselmeer, Enkhuizen, De    Kreupel, eiland M. | YES | M15 |  
    | 24-5-2024 | ...5629324 | 1 | H|W | Green | 5927 | 1 | - | 3 | IJsselmeer, Enkhuizen, De    Kreupel, eiland M. | YES | M15 |  
    | 24-5-2024 | ...5629325 | 1 | H|X | Green | 5927 | 1 | - | 3 | IJsselmeer, Enkhuizen, De    Kreupel, eiland M. | YES | M15 |  below: Caspian Gull cachinnans hybrid H|X 1CY, August 05 2024,   colony De Kreupel, the Netherlands.  Picture: Thijs Horst.Most likely with Herring Gull influences, to say the least. 
 
 |