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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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 D|A 1CY-3CY, May 2021 - December 2023, De Kreupel - Almere, the Netherlands. Picture: Mars Muusse, Eric Roeland, Leon Kelder, Merijn Loeve & Thijs Horst.

Tibia ring b[D|A] and metal Arnhem NLA 5.556.744, ringed as pullus Larus cachinnans on May 14 2021 at nest M01 21 in colony De Kreupel, the Netherlands (5247.00 N 513.00 E) - ringer Leon Kelder.
ID is uncertain: both parents are unknown. Still, picture October 2021 illustrates what seems a perfect cachinnans.

Recoveries:
13-08-2021 Markermeer (Trintelzand), Flevoland, NL 5.238,00 N 522,00 E colourring read Merijn Loeve
29-10-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
20-11-2021 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Jan Zorgdrager
04-12-2021 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
10-12-2021 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
06-03-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
10-04-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
01-12-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
22-01-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
28-02-2023 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
28-02-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
07-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
06-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
19-10-2023 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
29-11-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
01-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
06-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Gabi Martin
06-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst

Data for nest M01-2021:

Date: details:          
9-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210426774/ A egg 52.9 74.5
  B egg 50.9 73.9
C egg 51.3 71.4
23-4-2021 3 eggs in nest.
Attempt to trap breeding adult. Failed.
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd 1x. NLA 5.556.742 r-K.8 233 68.7 44.7
https://waarneming.nl/observation/214663900/ NLA 5.556.743 r-K.9 314 74.5 48.6
    NLA 5.556.744 b-D|A 311 73.4 73.4
         
20-5-2021 No chicks near nest, nest is empty, but shit traces.          

below: Caspian Gull cachinnans D|A 3CY, December 06 2023, Almere, the Netherlands. Picture: Mars Muusse & Thijs Horst.

below: Caspian Gull cachinnans D|A 3CY, December 01 2023, Almere, the Netherlands. Picture: Mars Muusse.

below: Caspian Gull cachinnans D|A 3CY, November 29 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans D|A 3CY, October 19 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans D|A 3CY, April 07 2023, Almere - De Vaart, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans D|A 3CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans D|A 3CY, February 28 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans D|A 2CY, April 10 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans D|A 2CY, March 06 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans D|A 1CY, October 29 2021, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans D|A 1CY, August 13 2021, Trintelhaven-Houtribdijk, the Netherlands. Picture: Merijn Loeve.

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