| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
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 Lelystad 2021nest  y-PNED
 nest  y-PLDP
 nest  y-PHSV
 nest  y-P:A02
 nest  y-P:U60
 nest zy-MT
 nest  r-FB
 nest  r-FC
 nest 001
 nest 003
 nest  006
 nest 011
 nest 012
 nest 013
 nest 014
 nest 015
 nest 016B
 nest 017
 nest 018
 nest  019
 nest 021
 nest 034
 nest 035
 nest 038
 nest 040
 nest 041
 nest 042
 nest 044
 nest 045
 nest 046
 nest 047
 nest 048
 nest 053
 nest 055
 nest 056
 nest 058
 nest 060
 nest 062
 nest 063
 nest 065
 nest 066
 nest 067
 nest 072
 | Caspian Gull cachinnans F|S 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong  & Mars Muusse.      
      Blue bar tibia  ring b[F|S], ringed as pullus Larus cachinnans on May 28 2021 at nest 13 in colony Lelystad, the Netherlands.ID  uncertain,     one parent is probably same bird as the parent of 2020, again Caspian Gull cachinnans type (or just within Caspian range in the hybrid zone). Possible partner may be sub-adult Herring Gull type, but remains uncertain.
 
 Visits and data nest 13: 
  
  
  
  
  
  
    | date: |  |  |  |  |  |  |  
    | 26-04-2021 | Adult bird landed on this location. First indication of occupied nest. |  
    |  |  |  |  |  |  |  |  
    |  | egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: |  |  
    | 06-05-2021 | A egg | 76,1 | 50,0 | 95,79 | 4 mm - floating | 3 eggs in nest. |  
    |  | B egg | 76,9 | 48,2 | 89,95 | 4 mm - floating |  |  
    |  | C egg | 73,8 | 48,7 | 88,13 | 1 mm - floating |  |  
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    | 15-05-2021 | Nest missed in control. |  
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    | 28-05-2021 |  | metal | tibia | mass | head + bill | possible parent: Herring Gull type sub-adult. |  
    |  | pullus | .5559402 | b-F|P | 210 | 58,8 |  |  
    |  | pullus | .5559403 | b-F|R | 190 | 67,2 |  |  
    |  | pullus | .5559404 | b-F|S | 185 | 65,2 |  |  
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    | 08-06-2021 | No visit. Spoonbill breeding here. |  
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    | 26-06-2021 | No visit. |  |  
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