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 1.U 1CY-3CY, October 2022 - July 2024, De Kreupel & Westkapelle, the Netherlands. Picture: Egbert Vrieling, Thijs Horst & Mars Muusse.

You can participate in this project too! Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl

Tibia ring R-1U and metal NLA Arnhem 5.623.518, ringed as pullus Arnhem on May 13 2022 at IJsselmeer (De Kreupel), Holland (5247.00 N 513.00 E) - ringer Leon Kelder.

Recoveries:
26-10-2022 Westkapelle (Zeedijk), Zeeland, NL 5.132,00 N 326,00 E colourring read Egbert Vrieling
27-03-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
10-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
11-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
19-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
28-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
05-08-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & T. Muusse

Bird from De Kreupel, nest L13 on island L. Data for this nest:

Date: Egg code Height (mm)  Width (mm) Comments Metal NLA Colour ring Wing (mm) Head+ bill (mm) Bill (mm) Mass (gr) Tarsus Gonys Swab no
14-4-2022 A-egg 71.2 50.6 3 eggs
B-egg 74.5 49.4
C-egg 69.6 49.9
29-4-2022 3 eggs
Adult trapped, Caspian Gull 6214038 Red 0.G 466 132.2 62.2 75.6 19.5 1070
13-5-2022 2 pulli outside nest 5623518 Red 1.U 71.5 78.6 420
5623519 Red 1.V 66.0 76.5 400

below: Caspian Gull cachinnans 1.U 3CY, July 28 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 1.U 3CY, July 19 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 1.U 1CY, October 26 2022, Westkapelle, the Netherlands. Picture: Egbert Vrieling.

Several good indicators for Caspian Gull, but head shape and head streaking reminiscent of Herring Gull.