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 T|P 1CY, 2025, the Netherlands & England. Picture: James Appleton, Mars Muusse & Thijs Horst.

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

Tibia G-T|P and metal NLA 5.641.084, 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 g-N|C.
Father: adult Caspian Gull g-N|E.
Nest: g-N|C & g-N|E (163). In 2025, G-T|P & G-R|S fledged, g-T|N not seen after ringing. Fledging rate for this nest 2025 = 2,0.

Recoveries:
09-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
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
23-08-2025 Walcott (Strand), Norfolk, ENGELAND 5.250,00 N 129,00 E colourring read James Appleton
20-10-2025 Seaton (River), Devon, ENGELAND 5.042,50 N 303,28 W colourring read Gavin Haig

Visits and data 2025 for nest g-N|C & g-N|E (163).

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-N|C & g-N|E cach cach 70,6 47,8 70 49,6 69,8 49 3
(163)  
dam: dam 1 blocks
location: nest 163 "Vliertje", at blocks west part, close to waterfront, next to Elderberry.
parents:
same as 2024, this year both parents ringed, now g-N|C and g-N|E.
ringed:
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
28-04-2025 g-N|C 5641012 163, vliertje PONT F >4CY 439 859 124,6 55,1 67,8 18 5,5
28-04-2025 g-N|E 6254554 163, vliertje PONT M >4CY 465 1128 128,7 61,4 70,3 20,1 5
13-05 g-T|N 5641083 163 PONT pullus 537
13-05 g-T|P 5641084 163 PONT pullus 453
31-05 g-T|P g-N|C & g-N|E PONT 819
31-05 g-R|S 5641913 g-N|C & g-N|E PONT pullus 787
Herring Gull?
09-06-2025 g-R|S 5641913 g-N|C & g-N|E PONT pullus 758 CONTROL    
OBSERVATIONS:
23-04-2025 eggs
3 eggs, measured.
adult
female cachinnans.
28-04-2025 eggs
2x eggs hatching.
adult
2x cachinnans trapped on nest now g-N|C and g-N|E.
01-05 adult
g-N|E present.
13-05 chicks
2x chicks ringed, 3rd not found.
31-05 chicks
retrapped g-T|P.
09-06-2025 chicks
g-R|S found and measured, g-T|P near nest 139 on blocks.
    Conlusion: g-T|P & g-R|S fledged, g-T|N not seen after ringing.

below: Caspian Gull cachinnans T|P 1CY, August 23 2025, Walcott - Norfolk, England. Picture: James Appleton.

Gull cachinnans T|P 1CY, July 11 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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

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

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

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

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

date darvic metal nest species sexe age wing mass head+ bill bill gonys barcode comments
13-5-2025 G-T|P .5641084 163 PONT   pullus   453         Ringed pullus