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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Caspian Gull cachinnans K.K adult, April 2021, July 2022 & July 2023, De Kreupel, the Netherlands. Pictures: Merijn Loeve, Leon Kelder & Jeroen van Assema.

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

Tibia ring R-KK and metal ring NLA Arnhem 6.211.444, ringed as adult Larus cachinnans on April 23 2021 at IJsselmeer (De Kreupel), Holland (5247.00 N 513.00 E) - ringer Roland-Jan Buijs.

After breeding recoveries:
29-11-2021, Sonzay (dump), Indre-et-Loire, FRANCE (4.730,00 N 28,00 E) - Patrick Derrien
17-06-2022 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder & Maarten Hotting
01-07-2022 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Jeroen van Assema
05-02-2023 Wieringerwerf (Wagenpad), Noord-Holland, NL 5.247,00 N 505,00 E colourring read Bert Winters
01-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
28-07-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E found dead Leon Kelder

Bird from De Kreupel, nest C2-2021 on island C. Data for this nest:

date: egg no: width (mm): length (mm): volume (cm3):      comments:
09-4-2021 A 50.0 72.5       1 cold egg. Location is Kreupel - C nest 2.
23-4-2021 A 50.0 72.2       3 warm eggs. One parent trapped at nest.
23-4-2021 B 51.6 74.0        
23-4-2021 C 49.1 68.9        
             

Again present in 2022: De Kreupel, nest C4-2022 on island C. Data for this nest:

Date: Egg code Height (mm)  Width (mm) Comments Metal NLA Colour ring Wing (mm) Head+ bill (mm) Bill Mass (gr) Tarsus Swab no
14-4-2022 A-egg 76.1 51.7 3 eggs
B-egg 75.7 52.6
C-egg 76.6 52.7
13-5-2022 3 pulli in nest, ringed today 5620231 Red 0.P 46 70.7 279 1099
5620232 Red 0.R 50.5 70.0 277 1100
5620233 Red 0.S 50 73.3 307 1101
17-6-2022 1 fledged chick r-0.R, together with parent r- K.K

below: Caspian Gull cachinnans K.K adult, July 28 2023, De Kreupel, the Netherlands. Picture: Leon Kelder.

Dead.

below: Caspian Gull cachinnans K.K adult, July 01 2022, De Kreupel, the Netherlands. Picture: Jeroen van Assema.

below: Caspian Gull cachinnans K.K adult, April 23 2021, De Kreupel - C, the Netherlands. Pictures: Merijn Loeve.

Coordinator: Leon Kelder.
Ringers: Roland-Jan Buijs, Leon Kelder & Merijn Loeve.

r[K.K] and metal NLA 6.211.444, Caspian Gull 4+CY.
Wing: 459
Head + Bill: 124,2
Bill: 53,8
Bill height: 18,0
Tarsus: 69,5
Kodak grey scale: 5,5
Weight: 994
Moult in primaries: P1-P10 old.