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.4 1CY, May 14 2021, De Kreupel - M, the Netherlands. Picture: Leon Kelder.

Red tibia ring r[K.4], ringed as pullus Larus cachinnans on May 14 2021 at nest KB 21 in colony De Kreupel, the Netherlands.
ID is uncertain: father is Caspian Gull cachinnans (or perhaps hybrid-type, ringed r-K.B), and mother is unknown.

Date: details:          
9-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210427139/ A egg 53.2 73.6
  B egg 53.2 72.1
         
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  C egg 51.6 70.9
  A egg 53.4 73.7
B egg 53.3 71.9    
         
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult male Caspian x Herring Gull hybrid type. NLA 6.211.437 Red-K.B 454 128.3 48.5
Adult vomited Spike Perch. mass: moult score: bill height: grey scale: Tarsus: & Swob:
https://waarneming.nl/observation/211828921/ -- 10x0 17.1 6 73.1 & 1078
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214663982/ NLA 5.556.736 r-K.2 281 69.3 45.8
  NLA 5.556.737 r-K.3 260 62.2 45.3
  NLA 5.556.738 r-K.4 319 62.2 51.8
         
20-5-2021 Found back only 1 pullus. metal: tibia: mass (gr): head + bill: wing:
  NLA 5.556.738 r-K.4 567 90.6 121.5