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|3 1CY, May 20 2021, De Kreupel - L, the Netherlands. Picture: Leon Kelder.

Blue tibia ring b[D|3] and metal NLA 5.556.759, ringed as pullus Larus cachinnans on May 20 2021 at nest L06 21 in colony De Kreupel, the Netherlands. No pictures, images below are from the same nest: b-D|2 & b-D|4.
ID is uncertain: both parents are unknown.

Recoveries:
23-7-2021 Cley (Marshes), Norfolk, ENGELAND 5.257,00 N 103,00 E colourring read Ashley Saunders

Date: details:          
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
Attempt to trap breeding adult. Failed.
           
14-5-2021 Could not relocate the nest.          
           
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
         
4-6-2021 No chicks near nest.          
Prey: fresh Eel 2x. https://waarneming.nl/observation/216520181/

below: Caspian Gull cachinnans D|3 1CY, July 23 2021, Cley (Marshes), Norfolk, UK. Picture: Ashley Saunders.