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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Nests at De Kreupel 2020
nest r-02P4 20
nest y-X804 20
nest D01 20
nest D02 20
nest D03 20
nest L01 20
nest L02 20
nest L03 20
nest M02 20

Nests at De Kreupel 2021
nest r-02P4 20
nest w-201U 21
nest g-XLHD 21
nest r-KA 21
nest r-KB 21
nest r-KC 21
nest r-KD 21
nest r-KE 21
nest r-KF 21
nest r-KH 21
nest r-KJ 21
nest r-KK 21
nest A01 21
nest C03 21
nest C04 21
nest C06 21
nest D01 21
nest D03 21
nest D05 21
nest D06 21
nest D07 21
nest D08 21
nest E01 21
nest H01 21
nest L01 21
nest L02 21
nest L05 21
nest L06 21
nest L07 21
nest M01 21
nest M04 21
nest M06 21
nest Q01 21

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.