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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Caspian Gull cachinnans N|6 1CY, 2025, colony Lelystad, the Netherlands. Picture: 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 G-N|6 and metal NLA 5.641.055, ringed as pullus Larus cachinnans on May 13 2025 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team (Mars Muusse / Thijs Horst / Fred Cottaar).

Recoveries:
30-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
09-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse

Visits and data 2025 for nest g-M|0 (021).

2025 parent 1 parent 2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST: # eggs
g-M|0 (021) cach cach 73,4 51,9 72,8 51,6 69 52 3
dam: dam 1 T-split
location: Nest 'de oksel' nest 21
parents: same as 2024, trapped Caspian Gull, now g-M|0
ringed:
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys
greyscale
23-04-2025 g-M|0 6254552 nest 21 cach M >4CY 470 1283 141,2 65,5 74,1 20,2 6  
13-05-2054 g-N|6 5641055 nest 21 g-M|0 PONT pullus 260 ringed pullus
13-05-2055 g-N|7 5641056 nest 21 g-M|0 PONT pullus 232 ringed pullus
09-06-2025 G-T|H 5641934 21 PONT pullus 842 ringed pullus  
09-06-2025 G-N|6 5641055 21 PONT pullus 834 CONTROL  
09-06-2025 G-N|7 5641056 21 PONT pullus 656 CONTROL  
OBSERVATIONS:
12-04-2025 nest cach present.
23-04-2025 eggs
3 eggs, measured.
adult
trapped male g-M|0, incubating 3 eggs at nest 21.
28-04 adult
attempted to trap unringed female partner, failed. Trapped g-M|0 again.
13-05 pullus
2x chicks ringed, 3rd not found.
09-06 pullus
1x ringed, 2 found and measured.
25-06-2025 pullus
g-n|7 found dead. Fledging: g-N|6 & g-T|H fledged. G-N|7 found dead (ring reused at nest r-5X in July).

G-T|H was used for nest P:U60 on May 13th, 2025. But chick found dead in colony, and ring used again, now for nest 21.
G-N|7 from nest 21, trapped and measured on June 09. Later, this chick was found dead, and ring used for nest r-5X on June 29.

Data for this nest in 2025:

date darvic metal nest species sexe age wing mass head+ bill bill gonys barcode comments
13-05-2025 G-N|6 .5641055 nest 21 g-M|0 PONT   pullus   260         Ringed pullus
09-06-2025 G-N|6 .5641055 21 PONT   pullus   834          

below: Caspian Gull cachinnans N|6 1CY, July 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans N|6 1CY, June 30 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

Together: g-N|6, g-T|H and g-M|0.

below: Caspian Gull cachinnans N|6 1CY, June 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans N|6 1CY, May 13 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.