| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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 |  Caspian Gull cachinnans FR 1CY-5CY,  2021-2025, the Netherlands. Picture: Leon Kelder, Thijs Horst & Mars Muusse. Pale blue   tibia  ring p[FR] and metal NLA 5.556.713, ringed as pullus Larus cachinnans on May 14 2021 at nest C06 21 in colony De Kreupel island C, the Netherlands. Ringer: Leon Kelder.ID  uncertain: 1 parent seems to be Herring Gull argentatus-type, other parent is unknown.
 Recoveries:20-05-2021 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
 11-06-2021 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
 12-04-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
 17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
 27-03-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
 30-05-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 24-06-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 01-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
 14-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mark Zevenbergen
 20-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
 03-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
 11-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mark Zevenbergen
 16-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
 12-04-2024 Wervershoof (Vooroever), Noord-Holland, NL 5.245,00 N 507,00 E colourring read Leon Kelder
 31-05-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 30-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read J. van Assema & T. Horst
 08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
 13-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & N. Colpaert
 18-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Loeve
 Visits and data for nest C06-2021: 
        
        
        
        
        
        
        
        
        
        
        
          | Date: | details: |  |  |  |  |  |  
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          | 14-5-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | tarsus: |  
          |  | Prey: 1x Roach; 2x Eel. | NLA 5.556.713 | Pale FR | 92 | 54.6 | 31.9 |  
          |  | https://waarneming.nl/observation/214662060/ | NLA 5.556.714 | Pale FS | 106 | 56.8 | 33.3 |  
          |  |  | NLA 5.556.715 | Pale FT | 76 | 51.3 | 29.1 |  
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          | 20-5-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | wing: |  
          |  | Prey: 1x Roach; 1x Rounded Goby. | NLA 5.556.713 | Pale FR | 313 | 71.1 | 52.0 |  
          |  | https://waarneming.nl/observation/214706998/ | NLA 5.556.714 | Pale FS | 296 | 72.4 | 57.5 |  
          |  |  | NLA 5.556.715 | Pale FT | 207 | 67.0 | -- |  
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          | 11-6-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | wing: |  
          |  | Prey: 4x Roach & 1x Perch (vomited) | NLA 5.556.713 | Pale FR | 1094 | 117.0 | 278.5 |  
          |  | https://waarneming.nl/observation/216984901/ | NLA 5.556.714 | Pale FS | 917 | 113.4 | 277.5 |  
          |  |  | NLA 5.556.715 | Pale FT | 1104 | 114.7 | 253.0 |  
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          |  |  |  |  |  |  |  |  below: Caspian Gull cachinnans FR 5CY,  July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse..JPG)

 below: Caspian Gull cachinnans FR 5CY,  April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
 below: Caspian Gull cachinnans FR 4CY, July 30 2024, colony De Kreupel, the Netherlands.  Picture: Thijs Horst.
 
 
 below: Caspian Gull cachinnans FR 4CY, February 01 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
 
 below: Caspian Gull cachinnans FR 3CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
 
 
 below: Caspian Gull cachinnans FR 2CY, April 12 2022, Almere, the Netherlands. Picture: Mars Muusse. 
below: Caspian Gull cachinnans FR 1CY, June 11 2021, De Kreupel  - C, the Netherlands. Picture: Leon Kelder. 
 
 below: Caspian Gull cachinnans FR 1CY, May 14 2021, De Kreupel  - C, the Netherlands. Picture: Leon Kelder. 
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