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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Breeding biology
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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 K.L 1CY, May - September 2021, De Kreupel, the Netherlands, Kilnsea & Cromer, Norfolk, UK. Picture: Andrew Hale & Leon Kelder.

Red tibia ring r[K.L], ringed as pullus Larus cachinnans on May 14 2021 at nest D07 in colony De Kreupel, the Netherlands.
ID certain, both parents are Caspian Gull cachinnans.

Date: details:          
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 49.1 68.3
  B egg 48.8 70.6
Attempt to trap breeding adult. Failed. C egg 49.7 70.7
         
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd spec. 2x NLA 5.556.719 Red K.L 73 48.6 27.3
https://waarneming.nl/observation/214662857/ NLA 5.556.720 Red K.M 80 53.5 29.8
NLA 5.556.721 Red K.N 96 53.6 29.2
           
20-5-2021 2 chicks & 1 dead chick (recent, r-K.M). metal: tibia: mass (gr): head + bill: tarsus:
Red K.M & metal 5556720 will be reused. NLA 5.556.719 Red K.L 217 64.8  
  NLA 5.556.720 Red K.M 96 61.6  
NLA 5.556.721 Red K.N 271 70.7  
  Camera trap near nest: 2 pulli & 2 unringed adults.          
  https://waarneming.nl/observation/223638304/          
   
11-6-2021 1 chick near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216985629/  NLA 5.556.721 Red K.N 880 109.5 271.0

Tibia R-KL and metal NLA Arnhem 5.556.719, ringed as pullus Larus cachinnans on 14-05-2021 at IJsselmeer (De Kreupel), Holland (NL 5247.00 N 513.00 E) - ringer Leon Kelder.

Recoveries:
20-05-2021, IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
19-08-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andrew Hale
30-08-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Paul Hyde
02-09-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andrew Hale
04-09-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Jeff Higgott

below: Caspian Gull cachinnans K.L 1CY, September 27 2021, Kilnsea, UK.

below: Caspian Gull cachinnans K.L 1CY, September 02 2021, Cromer, UK. Picture: Andy Hale.

below: Caspian Gull cachinnans K.L 1CY, August 19 2021, Cromer, Norfolk, UK (5.255,00 N 118,00 E). Picture: Andrew Hale.

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

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