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 A|H adult, 2024 - 2025, Lelystad colony, 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 ring G-A|H and metal NLA 5.631.202, ringed as breeding adult Larus cachinnans on April 30 2024 in nest 139-2024 at Lelystad, the Netherlands. Ringed by Mars Muusse (Roland-Jan Buijs ringing team).

Recoveries:
09-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
15-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
20-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
25-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
04-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
12-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
23-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Horst, Muusse(s) & Cottaar
25-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
28-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Horst, Muusse(s) & Cottaar
05-05-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-05-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
13-06-2025 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 2024

NEST code parent 1 parent  2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
g-A|H (139) cach cach 73 50,7 94,48 72,2 50,6 93,08 73 51 95,60 283,16
2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 10-4-2024 8-5-2024
   
dam: dam 1 east
location: most eastern nest on dam 1. same as 2023, with white/red isolation foam
parents? same as 2023
   
ring pulli: 12-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-4-2024 g-A|H .5631202 nest 139 PONT M >4CY 464 1127 134,4 54,6 71,0 21,0 8
                           
OBSERVATIONS:
21-4-2024 eggs: 3 eggs, measured. 
30-4-2024 adults: trapped male Caspian Gull, now g-A|H.

Visits and data 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
g-A|H & g-T|9 cach cach 73,1 50,4 72,2 52,1 72,2 51,1 3
dam:
dam 1 east
location:
No longer nest 139, it moved 40 m W towards old nest g-A|A 2024, Only visible from N-side dam 1
parents:
same as 2023-2024. Caspian Gulls, male is g-A|H and female trapped this year, now g-T|9.
ringed:
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-05-2025 g-T|9 5641858 139 PONT F >4CY 430 865 124,4 51,5 68,5 18,5 7
25-06-2025 G-R|7 5641970 G-A|H & G-T|9 PONT pullus 121
25-06-2025 G-R|8 5641971 G-A|H & G-T|9 PONT pullus 93
OBSERVATIONS:
16-03 nest
g-A|H & cach partner on blocks in front of nest, east dam 1, Also on bread
20-03 nest
g-A|H present around nest location 2024
21-03 nest
g-A|H present around nest location 2024
25-03 nest
g-A|H present around nest location 2024
23-04 nest
Nest close to g-A|A 2024, large black fender cushion placed in front of nest between stones
adult
g-A|H incubating
eggs
3 eggs, measured
28-04 nest
g-A|H incubating
30-05 nest
adult trapped, still 3 eggs
09-06-2025 nest 3 eggs
14-06-2025 nest 3 eggs
25-06-2025 chicks
2 chicks ringed, 1 rotten egg

below: Caspian Gull cachinnans A|H adult, April 28 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans A|H adult, April 04 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans A|H adult, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

At same location as 2022-2024: Dam 1 easternmost nest. Easy on bread today.
Interesting fact: next westernmost nest on dam 1 was in 2024 for g-A|A & n-F|T. But this year a 4CY newcomer has taken over and is bonding to g-A|A: it is r-6L. And r-6L is a 2022 offspring from nest 139!

below: Caspian Gull cachinnans A|H adult, July 15 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

Parent g-A|H and one of the 3 fledged chicks: g-M|C.

below: Caspian Gull cachinnans A|H adult, July 09 2024, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans A|H adult, April 30 2024, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-4-2024 g-A|H .5631202 nest 139 PONT M >4CY 464 1127 134,4 54,6 71 21 8