Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

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Herring Gull argentatus hybrid FJ 1CY, May 14 2021, De Kreupel nest XLHD 21, the Netherlands. Picture: Leon Kelder.

Pale blue tibia ring p[FJ], ringed as pullus Larus argentatus-type on May 14 2021 at nest XLHD 21 in colony De Kreupel, the Netherlands.
ID uncertain but probably backcross: unringed mother is Herring Gull argentatus and German ringed father is hybrid type.

Date: Egg no: Width (mm)  Higth (mm) Volume (cm3)   Details:
9-4-2021 A egg 51.5 70.3     3 eggs. Male is German g[XLHD], female is unringed.
  B egg 51.1 69.5     https://waarneming.nl/observation/210425539/
  C egg 51.9 72.3      
             
23-4-2021         3 eggs. Attempt to trap adult with cage. Failed.
   
14-5-2021 Metal: Tibia: Head + Bill: Tasus: Mass (gr): No eggs. 2 chicks out of nest. Where is 3rd chick?
5556706 Pale FG 62.8 38.7 162 https://waarneming.nl/observation/214568915/
5556707 Pale FJ 63.5 40.6 203
       
     
20-5-2021     No chicks near nest, but recent shit traces present. Alarming parents. .
     
28-5-2021     Alarming male approx 50 meters west. Pulli guarded to better hiding place?
    https://waarneming.nl/observation/215267282/
4-6-2021     Alarming male.
    https://waarneming.nl/observation/216519571/
17-6-2021     Alarming male.
    https://waarneming.nl/observation/217411696/