| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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 | Caspian Gull cachinnans 0.X 1CY-4CY,   2022-2025,  the Netherlands & England. Picture: Mark Golley, Andy Hale, Mike Buckland, Thijs Horst & Mars Muusse.Tibia red 0.X and metal NLA 5.620.238, ringed as  pullus Caspian Gull (Larus cachinnans) on  13-05-2022 at colony De Kreupel (IJsselmeer), the Netherlands (NL 5247.00 n 513.00 E), by ringer  Leon Kelder.  Recoveries:26-07-2022 British Continental Plat (Norfolk Banks), Noordzee, GB 5.302,00 N 112,00 E colourring read James McCallum
 26-07-2022 Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andy Hale
 16-07-2023 Cley (Marshes), Norfolk, ENGELAND 5.257,00 N 103,00 E colourring read Mark Golley
 22-07-2023 Sheringham (Strand), Norfolk, ENGELAND 5.256,00 N 112,00 E colourring read Kevin Shepherd
 24-07-2023 Cley (Marshes), Norfolk, ENGELAND 5.257,00 N 103,00 E colourring read Mike Buckland
 31-07-2023 Sheringham (Strand), Norfolk, ENGELAND 5.256,00 N 112,00 E colourring read Chris Clamsdell
 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 Peter van Horssen
 18-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Loeve
 26-07-2025 Andijk (Jachthaven), Noord-Holland, NL 5.244,00 N 510,00 E colourring read Thijs Horst
 Data for this nest in 2022 Bird from De Kreupel, nest C14 on island C. Parent is r-B=. 
      
      
      
      
      
      
      
      
        | Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill | Mass (gr) | Tarsus | Gonys | Swab no |  
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        | 14-4-2022 | A-egg | 70.0 | 51.8 | 2 eggs |  |  |  |  |  |  |  |  |  |  
        |  | B-egg | 71.1 | 51.2 |  |  |  |  |  |  |  |  |  |  |  
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        | 29-4-2022 |  |  |  | 3 eggs |  |  |  |  |  |  |  |  |  |  
        |  |  |  |  | Adult trapped, Caspian Gull | 6214032 | Red B= | 463,5 | 136.2 | 63.9 | 1172 | 81.8 | 19.4 | 1063 |  
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        | 13-5-2022 |  |  |  | 3 pulli in nest | 5620237 | Red 0.W |  | 52.8 |  | 87 |  |  |  |  
        |  |  |  |  |  | 5620238 | Red 0.X |  | 59.0 |  | 138 |  |  |  |  
        |  |  |  |  |  | 5620239 | Red 0.Y |  | 57.8 |  | 124 |  |  |  |  
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  below: Caspian Gull cachinnans 0.X 4CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse..JPG)
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 below: Caspian Gull cachinnans 0.X 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse..JPG)
 
 below: Caspian Gull cachinnans 0.X 2CY, July 24 2023, Cley - Norfolk, England. Picture: Mike Buckland.
 below: Caspian Gull cachinnans 0.X 2CY, July 16 2023, Cley - Norfolk, England. Picture: Mark Golley.
 below: Caspian Gull cachinnans 0.X 1CY, July 26 2022, Cromer, England. Picture: Andy Hale.
 
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