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|J adult, 2024 - 2025, 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|J and metal NLA 5.631.207, ringed as breeding adult female Larus cachinnans on April 30 2024 in nest 206-2024 at Lelystad, the Netherlands. Ringed by Mars Muusse (Roland-Jan Buijs ringing team).

Recoveries:
07-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
24-06-2024 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
01-04-2025 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
25-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
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
11-07-2025 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Thijs Horst

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|J (206) cach cach 66,5 51 87,09 70,3 50,7 90,99 70,3 48,3 82,58 260,65
2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 15-4-2024 13-5-2024
   
dam: dam 2 west
location: 8 mtr SW of Blue sign, was 206-2023/2022.
parents? Same as 2023?
   
ring pulli: 18-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-4-2024 g-A|J .5631207 Dam 2 PONT F >4CY 439 919 122 53,1 67 18,5 5
                           
                           
OBSERVATIONS:
12-4-2024 nest ready, but still empty
21-4-2024 eggs: 3 eggs, measured.
adult: 2x unringed cachinnans.
30-4-2024 adults: trapped female Caspian Gull, now g-A|J.

Visits and data 2025 for nest g-A|J (206).

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|J (206) cach cach 68,8 50,5 67,7 50 67,6 48,7 3
dam:
dam 2 west
location:
Same as 206 2022-2024; just SW of blue sign
parents:
same as 2024, g-A|J
ring pulli: 3-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
01-05-2025 g-N|L 5641018 g-A|J (206) PONT pullus 113
01-05-2025 g-N|M 5641019 g-A|J (206) PONT pullus 101
01-05-2025 g-N|N 5641020 g-A|J (206) PONT pullus 75
OBSERVATIONS:
16-03-2025 nest
g-A|J on bread, Also at location 2024 (nest 206, dam 2)
20-03 feeding
g-A|J present on bread around colony
21-03 feeding
g-A|J present on bread around colony
25-03 nest
g-A|J present
21-04 eggs
3 eggs, measured,
28-04 eggs
2 chicks, 1 very weak, 1 egg
01-05-2025 chicks
g-N|L & g-N|M vomit worms
08-05-2025 adult
both partners present, seems to be a failed season.

below: Caspian Gull cachinnans A|J adult, July 11 2025, Marker Wadden, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans A|J adult, May 05 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans A|J adult, April 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans A|J adult, March 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans A|J adult, March 21 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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

Caspian Gull 3CY r-7W, a 2023 chick from nest 206, also present today.

below: Caspian Gull cachinnans A|J 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|J .5631207 Dam 2 PONT F >4CY 439 919 122 53,1 67 18,5 5