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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Caspian Gull cachinnans K.8 1CY, May 14 2021, De Kreupel - M, the Netherlands. Picture: Leon Kelder.

Red tibia ring r[K.8], ringed as pullus Larus cachinnans on May 14 2021 at nest M01 21 in colony De Kreupel, the Netherlands.
ID is uncertain: both parents are unknown.

Date: details:          
9-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210426774/ A egg 52.9 74.5
  B egg 50.9 73.9
C egg 51.3 71.4
23-4-2021 3 eggs in nest.
Attempt to trap breeding adult. Failed.
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd 1x. NLA 5.556.742 r-K.8 233 68.7 44.7
https://waarneming.nl/observation/214663900/ NLA 5.556.743 r-K.9 314 74.5 48.6
    NLA 5.556.744 b-D|A 311 73.4 73.4
         
20-5-2021 No chicks near nest, nest is empty, but shit traces.