| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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 | Caspian Gull cachinnans 4.E 2CY, April 13 2023, Espinho, Portugal. Picture: Ana Dias Amaral. R-4E and metal Arnhem NLA 5.623.605, ringed as  pullus Larus cachinnans on May 26 2022 at De Kreupel, Holland (5247.00 N 513.00 E) by ringer  Leon Kelder.ID  uncertain.
 Recoveries:13-04-2023 Espinho (Strand), Douro Litoral, PORTUGAL 4.100,00 N 838,00 W colourring read Ana Dias Amaral
 13-12-2023 Getaria (Strand), Guipúzcoa, SPANJE 4.318,00 N 211,00 W colourring read Oliver Pérez Amas
 Bird from De Kreupel, nest F1 on island F.  Data for this nest: 
        
          | Date: | Comments | Metal NLA | Colour ring | Head+ bill (mm) | Mass (gr) |  
          |  |  |  |  |  |  |  
          | 29-4-2022 | 3 eggs |  |  |  |  |  
          |  |  |  |  |  |  |  
          | 13-5-2022 | 3 eggs |  |  |  |  |  
          |  |  |  |  |  |  |  
          | 26-5-2022 | 3 pulli  in nest, r-3.R & metal re-used here | 5623578 | Red 3.R | 48.0 | 63 |  
          |  | Herring Gull? | 5623604 | Red 4.D | 46.3 | 48 |  
          |  |  | 5623605 | Red 4.E | 53.0 | 93 |  below: Caspian Gull cachinnans 4.E 2CY, April 13 2023, Espinho, Portugal. Picture: Ana Dias Amaral.
 
 
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