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|9 1CY, May 20-30 2021, De Kreupel - L, the Netherlands. Picture: Leon Kelder.

Blue tibia ring b[D|9], ringed as pullus Larus cachinnans on May 20 2021 at nest KD 21 in colony De Kreupel, the Netherlands.
ID is uncertain: both parents are Caspian Gull cachinnans, male has been ringed r-K.D and female is unringed.

below: Caspian Gull cachinnans D|9 1CY, May 30 2021, De Kreupel - L, the Netherlands. Picture: Leon Kelder.

below: Caspian Gull cachinnans D|9 1CY, May 20 2021, De Kreupel - L, the Netherlands. Picture: Leon Kelder.

Date: details:          
23-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 48.4 69.3
  B egg 48.6 70.3
         
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult male Caspian Gull cachinnans. NLA 6.211.439 Red-K.D 472.0 141.0 70.5
  mass: moult score: bill height: grey scale: Tarsus: & Swob:
  1145 10x0 19.8 6.5 74.2 & 1080
           
14-5-2021 2 eggs in nest.          
         
20-5-2021 1 pullus & 1 hatching egg. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214709154/ NLA 5.556.761 b-D|9 76 51.5 28.8
         
28-5-2021 2 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
  NLA 5.556.761 b-D|9      
  NLA 5.556.775 r-B.6 285 70.3 42.0
         
31-5-2021 Camera trap near nest: 2 pulli (1x unringed???!!!) & 1 ringed adult & r-K.D.
https://waarneming.nl/observation/221650519/