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|A adult, April 2024 - April 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|A and metal NLA 5.625.288, ringed as breeding adult Larus cachinnans on April 23 2024 in nest n-F|T & g-A|A 2024 at Lelystad, the Netherlands. Ringed by Mars Muusse (Roland-Jan Buijs ringing team).

Recoveries:
26-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
10-03-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
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
05-05-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
30-05-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
13-06-2025 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

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:
n-F|T & g-A|A cach cach 69,3 51 90,76 69,3 48,9 83,44 68,5 50 86,22 260,42
2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 15-4-2024 13-5-2024
   
dam: dam 1 east
location: Location was 25-2022/2023, near PNED, on N side dam, with furious birds. Sprayed '#'.
parents? 2023 prospecting n-F|T.
   
ring pulli: 18-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
23-04-2024 g-A|A .5625288 nest n-F|T dam 1 PONT F >4CY 441 124,5 54,7 70,0 18,9 6
14-05-2024 .5631182 nest n-F|T / g-A|A PONT 1CY 74
14-05-2024 .5631183 nest n-F|T / g-A|A PONT 1CY 62
31-05-2024 g-C|6 .5631183 nest n-F|T / g-A|A PONT 1CY Colour ring added.
OBSERVATIONS:  
08-03-2024 adult: n-F|T on bread.
21-04-2024 eggs: 3 eggs, measured. 
adults: 5CY & adult
23-04-2024 adult partner trapped at nest, nog g-A|A.
14-05-2024 chicks: 2x ringed, only metal. Chicks 1 day old. Prognose was exact.

Data for nest r-6L in 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 A-egg
r-6L & g-A|A cach cach type 71,7 50,5 71,2 51 70,7 50,1 3 4/15/2025
dam:
dam 1 east
location:
new, S-side, 15 m W of old nest 139-2024, blue cushion placed.
parents: new
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys
OBSERVATIONS:
16-03-2025 nest
r-6L & g-A|A at location 2024 of g-A|A, now with new partner. Northside dam 1 east. Partner 2024, n-F|T, not present
20-03-2025 nest
both present on soos dam 2, and feeding on bread near poles end dam 2
25-03-2025 nest
both present on dam 1 opposite side of the dam around nest location g-A|A 2024
01-04-2025 nest
Both present, same location as 3/25/2025 (barend side of the dam)
21-04-2025 nest
Both present, same location, g-A|A incubating; r-6L brings in extra nest materials
23-04-2025 nest
blue fender cushion placed in front of nest between stones
adult
g-A|A incubating
eggs
3 eggs, measured
30-05-2025 nest
2 eggs, now on other side of dam. First nest failed
09-06-2025 nest 2 eggs
14-06-2025 nest 2 eggs
25-06-2025 nest
2 eggs, warm
29-06-2025 nest
2 eggs warm no cracks. Season failed.

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

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

Couple male 4CY hybrid Caspian Gull r-6L and female adult Caspian Gull g-A|A.

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

Still bonding with r-6L, but now on dam 1 west.

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

Breeding with 5CY male n-F|T in Lelystad in 2024, and bonding to 4CY male r-6L in 2025.

below: Caspian Gull cachinnans A|A adult, April 23 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
23-4-2024 g-A|A .5625288 nest n-F|T dam 1 PONT F >4CY 441 124,5 54,7 70,0 18,9 6