| Coordinators: Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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 Nests at De Kreupel 2021nest  r-02P4 20
 nest w-201U 21
 nest g-XLHD 21
 nest r-KA 21
 nest r-KB 21
 nest r-KC 21
 nest r-KD 21
 nest r-KE 21
 nest r-KF 21
 nest r-KH 21
 nest r-KJ 21
 nest r-KK 21
 nest A01 21
 nest C03 21
 nest C04 21
 nest C06 21
 nest D01 21
 nest D03 21
 nest D05 21
 nest D06 21
 nest D07 21
 nest D08 21
 nest E01 21
 nest H01 21
 nest L01 21
 nest L02 21
 nest L05 21
 nest L06 21
 nest L07 21
 nest M01 21
 nest M04 21
 nest M06 21
 nest Q01 21
 |  Caspian Gull cachinnans D|4  1CY, May 20 2021, De Kreupel  - L, the Netherlands. Picture: Leon Kelder. Blue  tibia  ring b[D|4], ringed as pullus Larus cachinnans on May 20 2021 at nest L06 21 in colony De Kreupel, the Netherlands.ID is uncertain: both parents are unknown.
 
 
        
        
        
        
        
        
        
        
        
        
        
          | Date: | details: |  |  |  |  |  |  
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          | 23-4-2021 | 3 eggs in nest. | egg no: | width (mm): | length (mm): | volume (cm3): |  |  
          |  |  | A egg | 49.8 | 73.4 |  |  |  
          |  |  | B egg | 50.9 | 71.7 |  |  |  
          |  |  | C egg | 51.4 | 72.1 |  |  |  
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          |  | Attempt to trap breeding adult. Failed. |  
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          | 14-5-2021 | Could not relocate the nest. |  |  |  |  |  |  
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          | 20-5-2021 | 3 pulli in nest. | metal: | tibia: | mass (gr): | head + bill: | tarsus: |  
          |  | Prey: Roach 2x. | NLA 5.556.758 | b-D|2 | 132 | 58.3 | 35.1 |  
          |  | https://waarneming.nl/observation/214710481/ | NLA 5.556.759 | b-D|3 | 87 | 54.0 | 36.1 |  
          |  |  | NLA 5.556.760 | b-D|4 | 119 | 58.8 | 33.7 |  
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          | 4-6-2021 | No chicks near nest. |  |  |  |  |  |  
          |  | Prey: fresh Eel 2x. https://waarneming.nl/observation/216520181/ |  
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