| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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   | Caspian Gull cachinnans  7|N 1CY, May  - October 2023, England & the Netherlands.  Picture: Clive Saunders, Thijs Horst & Mars Muusse.
      Tibia ring G-7|N and metal NLA 5.556.405, ringed as pullus Larus cachinnans on May 18 2023 in nest PNED at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team. Recoveries:16-10-2023 Amble Harbour (Strand), Northumberland, ENGELAND 5.520,00 N 134,00 W colourring read Clive Saunders & Ian Fisher
 
        
        
        
        
          | 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 cach | PNED | 73,4 | 52,1 | 100,32 | 73,1 | 50 | 92,01 | 68 | 49,8 | 84,91 | 277,24 | same as 2022 |  
          |  |  |  |  |  |  |  |  |  |  |  |  |  |  
          | ring pulli: 9-mei | laying A egg: 6-apr | hatch A egg: 4-mei |  |  |  |  |  |  |  |  
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          | catch: | date: | metal: | darvic: | mass: | wing: | head+bill: |  |  |  |  |  |  
          | Pullus | 18-05-2023 | 5556405 | G-7|N | 635 | -- | 95 |  |  |  |  |  |  |  
          | Pullus | 18-05-2023 | 5556406 | G-7|P | 616 | -- | 92,3 |  |  |  |  |  |  |  
          | Pullus | 27-05-2023 | 5556405 | G-7|N | 1030 | -- | -- |  |  |  |  |  |  |  
        
        
        
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          | PNED | nest    136-2022 |  |  |  |  
          | dam: | dam 1 east |  |  |  |  
          | location: | Visible from N. |  |  |  |  
          | breeders: | cach x cach |  |  |  |  
          | OBSERVATIONS: |  |  |  |  |  
          | 09-04-2023 | adult: | male unringed cach &    female cach yPNED present at location. So search for nest today. |  
          | 26-04-2023 | adult: | male unringed cach &    female cach yPNED present at location. |  
          |  | nest: | code 136, birds have    moved to this location. "136" sprayed on block + blue foam. |  
          |  | eggs: | 3x eggs, measured. | A | 1 mm - float |  
          |  |  |  |  | B | 1 mm - float |  
          |  |  |  |  | C | 1 mm - float |  
          | 13-05-2023 | adult: | cach male. |  |  |  
          | 18-05-2023 | pulli: | 2 chicks ringed, 3rd not    found. |  |  
          | 27-05-2023 | pulli: | 1 chick measured. |  
          | 18-06-2023 | pulli: | g-7|P & g-7|N present    + unringed sibling. 3x fledged from PNED. |  
          |  | adult: | y-PNED present. Unringed    male guarding g-7|P. |  
          | 25-06-2023 | pulli: | g-7|N alone, g-7|P with unringed sibling. |  below: Caspian Gull cachinnans  7|N 1CY, October 16 2023, Amble Harbour - Northumberland, England. Picture: Clive Saunders.
   below: Caspian Gull cachinnans  7|N 1CY, July 18 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst & Mars Muusse.
 
 
 
 below: Caspian Gull cachinnans  7|N 1CY, July 15 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst & Mars Muusse.
 below: Caspian Gull cachinnans  7|N 1CY, July 08 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst & Mars Muusse.
 below: Caspian Gull cachinnans  7|N 1CY, June 25 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst.
 below: Caspian Gull cachinnans  7|N 1CY, June 18 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst & Mars Muusse.
 
 below: Caspian Gull cachinnans  7|N 1CY, May 18 2023, Lelystad colony, the Netherlands.  Picture:  Thijs Horst & Mars Muusse.
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