| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
 Home Project InfoInternational trend
 National trend
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 Breeding biology
 Fecundity
 Food resources
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 Hybrid scores
 Ring codes
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 Nests at De Kreupel 2020nest  r-02P4 20
 nest y-X804 20
 nest D01 20
 nest D02 20
 nest D03 20
 nest L01 20
 nest L02 20
 nest L03 20
 nest M02 20
 Nests at De Kreupel 2021nest  r-02P4 20
 nest w-201U 21
 nest g-XLHD 21
 nest r-KA 21
 nest r-KB 21
 nest r-KC 21
 nest r-KD 21
 nest r-KE 21
 nest r-KF 21
 nest r-KH 21
 nest r-KJ 21
 nest r-KK 21
 nest A01 21
 nest C03 21
 nest C04 21
 nest C06 21
 nest D01 21
 nest D03 21
 nest D05 21
 nest D06 21
 nest D07 21
 nest D08 21
 nest E01 21
 nest H01 21
 nest L01 21
 nest L02 21
 nest L05 21
 nest L06 21
 nest L07 21
 nest M01 21
 nest M04 21
 nest M06 21
 nest Q01 21
 | Caspian Gull cachinnans 2.3 1CY-3CY, July  2022 - July 2024, De Kreupel, the Netherlands. Picture: Jeroen van Assema & Thijs Horst.
        
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            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Tibia  R-23 and metal Arnhem 5.623.556, ringed as  pullus Larus cachinnans on May  20 2022 at  IJsselmeer (De Kreupel), Holland (5247.00 N, 513.00 E). 
      Ringer: Leon Kelder. Recoveries:01-07-2022 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Jeroen van Assema
 20-08-2022 Vlissingen-Oost (Vuiloverslag RCZ), Zeeland, NL 5.126,00 N 344,00 E colourring read Mark Zevenbergen
 30-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read J. van Assema & T. Horst
 Bird from De Kreupel, nest P2 on island P. Data for this nest:     
        
        | Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill (mm) | Mass (gr) |  
        |  |  |  |  |  |  |  |  |  |  |  |  
        | 20-5-2022 | A-egg |  |  | 2 pulli at nest | 5623556 | Red 2.3 | 77.5 | 76.8 |  | 405 |  
        |  |  |  |  |  |  | Red 2.4 | 97.5 | 81.8 |  | 528 |  
        |  |  |  |  |  |  |  |  |  |  |  |  
        | 26-5-2022 |  |  |  | 1 dead chick at nest, unringed |  |  |  |  |  |  |  below: Caspian Gull cachinnans 2.3 3CY, July 30 2024, colony De Kreupel, the Netherlands.  Picture: Thijs Horst.
 
 below: Caspian Gull cachinnans 2.3 1CY, July 01 2022, De Kreupel, the Netherlands. Picture: Jeroen van Assema.With r-2.4. 
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