| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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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 P:0K4 3CY-6CY, August 2021 - March  2024, colony De Kreupel, the Netherlands. Picture: Leon Kelder, Thijs Horst & Mars Muusse.Caspian Gull (Larus cachinnans) with yellow tarsus P:0K4. Ringed as pullus on May 25 2019 at mixed colony  (Larus cachinnans kolonia) Kozielno, Poland.
 Recoveries:       
        
          
            | 25/05/2019 | ZB.KOZIELNO,PACZKÓW, 
              POLAND (DOLNOŚLĄSKIE) | ODRA: 
              Jakub Szymczak, 
              Paweł Grochowski, Małgorzata Pietkiewicz |  
            | 25/05/2019 | ZB.KOZIELNO,PACZKÓW, 
              POLAND (DOLNOŚLĄSKIE) | ODRA: 
              Jacek Betleja |  
            | 23/08/2020 | Ćwiercie, 
              POLAND (OPOLSKIE) | Rafał Świerad |  
            | 18/11/2020 | Staré Ždánice, 
              CZECH REPUBLIC (PARDUBICKY) | PRAHA .CZP: 
              Miloš Peitne |  
            | 12/08/2021 | Enkhuizen, De Kreupel, 
              NETHERLANDS (FLEVOLAND) | Leon Kelder |  
            | 29/07/2022 | Enkhuizen, De Kreupel, 
              NETHERLANDS (FLEVOLAND) | Leon Kelder |  
            | 16/11/2022 | Salzgitter-Heerte:Deponie, 
              GERMANY (NIEDERSACHSEN: BRAUNSCHWEIG) | Gerhard Braemer |  
            | 18/11/2022 | Salzgitter-Heerte:Deponie, 
              GERMANY (NIEDERSACHSEN: BRAUNSCHWEIG) | Gerhard Braemer |  
            | 16/02/2023 | Zalew Witoszówka,Świdnica, 
              POLAND (DOLNOŚLĄSKIE) | Jarosław Słowikowski, 
              Kuling |  
            | 04/03/2024 | De Kreupel, 
              NETHERLANDS (FLEVOLAND) | thijs horst & 
              Mars Muusse |  below: Caspian Gull cachinnans P:0K4 6CY, March 04 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
 
 
 below: Caspian Gull cachinnans P:0K4 3CY, August 12 2021, colony De Kreupel, the Netherlands. Picture: Leon Kelder.
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