| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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   | Lesser Black-backed Gull graellsii    9|F 1CY, May 27 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst & Mars Muusse.
      Tibia ring G-9|F and metal NLA 5.625.282, ringed as pullus Larus fuscus on May 27 2023 in nest 061Z at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.       
        
        
        
        
        
        
          | 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? |  
          | teus x teus | 61Z | 67,3 | 49 | 81,36 | -- | -- | -- | -- | -- | -- | 81,36 | same as 2022 |  
          |  |  |  |  |  |  |  |  |  |  |  |  |  |  
          | ring pulli: nn |  | laying A egg: nn | hatch A egg: nn |  |  |  |  |  |  |  |  
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          | catch: | date: | metal: | darvic: | mass: | wing: | head+bill: |  |  |  |  |  |  |  
          | Pullus | 27-5-2023 | 5.625.280 | g-8|+ | 210 | -- | teus | in cluster of nests. |  |  |  |  
          | Pullus | 27-5-2023 | 5.625.282 | g-9|F | 218 | -- | KMM | Observed it with 2 LBBG parents (positive interaction). |  
          | Pullus | 27-5-2023 | 5.625.283 | g-9|E | 230 | -- | teus | in cluster of nests. |  |  |  |  
        
        
        
        
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          | 61Z | Herring    Gulls |  |  
          | dam: | dam 1 west |  |  
          | location: | Is in front of n[F|N].    Same as 61-2023. |  
          | breeders: | teus x teus |  |  
          | OBSERVATIONS: |  |  |  
          | 22-4-2023 | nest | 1 egg. |  |  
          | 27-4-2023 | adult: | 2x Herring Gull partners. |  
          | 13-5-2023 | adult: | 2x Herring Gull partners. |  
          | 27-5-2023 | pulli: | 2x teus pulli ringed.    Later a 3rd (g-9|F) pullus ringed at this very same location, believed to belong to 61 as well. But from boat we    observed it with LBBG parents (positive interaction). |  below: Lesser Black-backed Gull graellsii  9|F 1CY, May 27 2023, Lelystad colony, the Netherlands.  Picture: Thijs Horst & Mars Muusse.
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