Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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Caspian Gull cachinnans D|N 1CY, May - June 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.

Blue tibia ring b[D|N], ringed as pullus Larus cachinnans on May 14 2021 at nest C03 21 in colony De Kreupel, the Netherlands.
ID uncertain, parents unknown.

below: Caspian Gull cachinnans D|N 1CY, May 20 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.

below: Caspian Gull cachinnans D|N 1CY, June 11 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.

Date: details:          
           
23-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    A egg 50.9 63.6  
    B egg 50.9 68.9  
  Attempt to trap breeding adult. Failed.          
             
14-5-2021 2 eggs in nest.          
             
20-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: 3x Roach. NLA 5.556.751 b-D|N 115 56.5 32.2
  https://waarneming.nl/observation/214707132/ NLA 5.556.752 b-D|P 73 47.8 27.0
   
11-6-2021 2 chicks near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216984848/  NLA 5.556.751 b-D|N - 104.4 228.5
    NLA 5.556.752 b-D|P 681 93.3 182.5