| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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   | Caspian Gull cachinnans  7|L 1CY, May - August 2023, Lelystad & Westkapelle, the Netherlands.  Picture: Thijs Horst, Theo & Mars Muusse.Tibia ring G-7|L and metal NLA 5.556.403, ringed as pullus Larus cachinnans on May 18 2023 in nest 035 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team. Recoveries:31-07-2023 Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andy Hale
 30-08-2023 Westkapelle (Vroon van Westkapelle), Zeeland, NL 5.132,00 N 326,00 E colourring read Roland-Jan Buijs
 
        
        
        
        
          | egg sizes & volume 2023 |  |  |  |  |  |  |  |  
          | SPECIES | NEST | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | known parents? |  
          | cach x teus or cach x cach    (327U??)
 | 141-2023 | 75,1 | 53,3 | 107,42 | 73,8 | 51,5 | 98,55 | 71,9 | 50 | 90,50 | 296,48 | same male as 2022 |  
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          | ring pulli: May 10th. | laying A egg: Apr 5th. | hatch A egg: May 3rd. |  |  |  |  |  |  |  |  
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          | catch: | date: | metal: | darvic: | mass: | wing: | head+bill: |  |  |  |  |  |  
          | Pullus | 18-5-2023 | 5556403 | G-7|L | 475 |  | 92 |  |  |  |  |  |  |  
          | Pullus | 18-5-2023 | 5556404 | G-7|M | 490 |  | 90 |  |  |  |  |  |  |  
        
        
        
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          | 141-2023 (formerly 035) |  |  
          | dam: | dam 1 east |  |  
          | location: | on block at N-side, east    of PNED. Code 141 on block. "the Caspian of nest 035 always fighting the    Herring". |  
          | breeders: | cach x teus or cach x    cach (327U??) |  
          | OBSERVATIONS: |  |  |  
          | 9-4-2023 | nest: | 3 eggs measured. No    watertest, ring chicks in 1st session. |  
          |  | adult: | female is teus, male is    huge aggressive cachinnans |  
          | 13-5-2023 | adult: | male cach. Female = cach    w-327:U? Of is er een nest vlak achter? |  
          | 18-5-2023 | pulli: | 2 chicks ringed, 3rd not    found |  
          | 27-5-2023 | pulli: | dense vegetation, nothing    found. |  
          | 25-6-2023 | pulli: | g-7|L present guarded by    w-327:U  twice |  below: Caspian Gull cachinnans  7|L 1CY, August 30 2023, Westkapelle, the Netherlands.  Picture:  Theo Muusse.
 
 below: Caspian Gull cachinnans  2|L 1CY,  July 31 2023, Cromer - Norfolk, England. Picture: Andy Hale.With g-3|N (left). 
 below: Caspian Gull cachinnans  7|L 1CY, July 08 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst & Mars Muusse.
 
 
 below: Caspian Gull cachinnans  7|L 1CY, June 25 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst.
 
 
 
 
 below: Caspian Gull cachinnans  7|L 1CY, June 18 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst & Mars Muusse.
 
 
 below: Caspian Gull cachinnans  7|L 1CY, May 18 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst.
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