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 FN 1CY, May 14 2021, De Kreupel nest KK 21, the Netherlands. Picture: Leon Kelder.

Pale blue tibia ring p[FN], ringed as pullus Larus cachinnans-type on May 14 2021 at nest KK 21 in colony De Kreupel island C, the Netherlands.
ID uncertain: one parent is Caspian Gull cachinnans r[K.K], other parent unknown.

Nest data:

Date: details:            
    egg no: width (mm): length (mm): volume (cm3): 
9-4-2021 1 egg in nest, cold.
https://waarneming.nl/observation/210432243/
A egg 50.0 72.5  
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    B egg 51.6 74.0
    C egg 49.1 68.9
  A egg 50.0 72.2
metal: tibia: wing: head + bill: bill:  
Adult male trapped at nest. NLA 6.211.444 Red-K.K 459.0 124.2 53.8  
    mass: tarsus: moult score: bill height: grey scale Swob
    994 69.5 10x0 18.0 5.5 1086
   
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  https://waarneming.nl/observation/214661812/ NLA 5.556.710 Pale FN 115 57.3 33.8  
    NLA 5.556.711 Pale F0 223 67.4 43.6  
    NLA 5.556.712 Pale FP 211 67.6 44.4  
   
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
    5556710 Pale FN 321 72.2 56.5
    5556711 Pale F0 517 85.2 94.5
    5556712 Pale FP 506 84.0 90.0

below: Caspian Gull cachinnans FN 1CY, May 14 2021, De Kreupel nest KK 21, the Netherlands. Picture: Leon Kelder.