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

Blue tibia ring b[D|T], ringed as pullus Larus cachinnans on May 20 2021 at nest D08 21 in colony De Kreupel, the Netherlands.
ID is uncertain: father is y[X311] Caspian Gull cachinnans ringed as pullus in Germany, mother is unringed Herring Gull argentatus hybrid-type.

Date: details:          
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 53.0 75.3
  B egg 51.0 73.7
Attempt to trap breeding adult. Failed. C egg 52.1 78.6
         
14-5-2021 3 eggs in nest.          
             
             
20-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Rounded Goby 2x; Eel 1x. NLA 5.556.753 b-D|S 149 61.1 35.0
https://waarneming.nl/observation/214707477/ NLA 5.556.754 b-D|T 108 56.3 32.8
NLA 5.556.755 b-D|U 163 62.3 36.2
           
20-5-2021 Camera trap near nest: 3 pulli & 2 adults. Caspian Gull cachinnans male y[X311] from Germany & Herring Gull type / hybrid female.
           
11-6-2021 2 chicks near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216987545/ NLA 5.556.753 b-D|S 1057 110.3 240.0
    NLA 5.556.755 b-D|U 1130 114.1 249.0