| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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 | Caspian Gull cachinnans 0.1 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
        
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            Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl |  Tibia ring R-01 and metal NLA 5.620.242, ringed as  pullus Larus cachinnans on May  13 2022 at  De Kreupel, Holland, NL 5247.00 513.00 E, by ringer  Leon Kelder. Recoveries:17-08-2022 Renesse (Verklikkerplaat), Zeeland, NL 5.144,00 N 343,00 E colourring read Maarten Sluijter
 17-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
 08-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 12-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 17-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 20-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 02-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 17-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 12-08-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
 08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
 Data for this nest in 2022 Bird from De Kreupel, nest D9-2022 on island D.  
      
        | Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill | Mass (gr) |  
        |  |  |  |  |  |  |  |  |  |  |  |  
        | 13-5-2022 |  |  |  | 3 chicks in nest | 5620240 | Red 0.Z |  | 48.4 |  | 69 |  
        |  |  |  |  |  | 5620241 | Red 0.0 |  | 55.9 |  | 98 |  
        |  |  |  |  |  | 5620242 | Red 0.1 |  | 54.2 |  | 90 |  
        |  |  |  |  |  |  |  |  |  |  |  |  
        | 14-5 - 17-5-2022 cameratrap: | female adult Caspian |  |  |  |  |  |  |  
        |  |  |  |  | male 4CY Caspian |  |  |  |  |  |  |  below: Caspian Gull cachinnans 0.1 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
 
 
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