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|= 1CY, 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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

Tibia G-N|= and metal NLA 5.641.062, 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).
Mother: adult Caspian Gull.
Father: adult Caspian Gull.
Nest: 033-2025. In 2025, g-N|= fledged as only chick. Fledging rate for this nest 2025 = 1,0.

Recoveries:
13-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
25-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
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
11-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst

Visits and data 033-2025.

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
33 cach cach 74,9 49,5 70,8 48,6 2
dam:
dam 1 blocks.
location:
Nest is northeast in blocks section, yellow football near nest, Top of dam, most eastern nest in section.
parents:
ring pulli:
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
13-05-2025 g-N|= 5641062 33 PONT pullus 337
09-06-2025 g-N|=
5641062
 PONT pullus 1169 CONTROL    
OBSERVATIONS:
16-03-2025 nest
2x cach at location 2024, possibly same parents as 2024.
20-03-2025 nest
2x cach at location 2024.
23-04-2025 eggs
2 eggs, measured.
01-05-2025 eggs
1x egg only (very tiny crack), no sign of chick.
adult
2x Caspian Gulls.
08-05-2025 adult
both partners present.
13-05-2025 chick
one chick ringed.
09-06-2025 chick
g-N|= found and measured. Fledged.

below: Caspian Gull cachinnans N|= 1CY, July 11 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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

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

below: Caspian Gull cachinnans N|= 1CY, June 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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

date darvic metal nest species sexe age wing mass head+ bill bill gonys barcode comments
13-05-2025 G-N|= .5641062 33 PONT   pullus   337         Ringed pullus
09-06-2025 G-N|= .5641062 33 PONT   pullus   1169