Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans 8.B 1CY, May - June 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring R-8|B and metal NLA 5.556.481, ringed as pullus Larus cachinnans on May 11 2023 in nest 131 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
11-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
18-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
26-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
12-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder

egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST: known parents?
cach x ? 131-2023 69 47,1 77,07 68,5 49,4 84,17 67,4 46,7 74,01 235,25 same as 2022?
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill:
pullus 11-5-2023 5556480 r-8M   nest with 3 chicks, between micha-nest and nest 'branch with 2 stripes'. Halfway blocks, on top of dam.
pullus 11-5-2023 5556482 r-8A
pullus 11-5-2023 5556481 r-8B
pullus 18-6-2023 r-8M  
pullus 18-6-2023 r-8B together with r-8A, dam 1 blocks east (branch with 2 stripes after all?)
pullus 18-6-2023 r-8A together with r-8B, dam 1 blocks east (branch with 2 stripes after all?)
 
131-2023
dam: dam 1 blokken
location: is nest 131-2022? 8 m east of PU60. 
breeders: cach x ?
OBSERVATIONS:
26-4-2023 eggs: 3x egg, measured. No water test.
11-5-2023 pullus: 3 chicks ringed here: r-8A, r-8B & r-8M. Uncertainty about adults, about nest, and uncertainty about ID.
27-5-2023 nest: The branch with 2 stripes taken away, and placed vertically at (new nest) 26.
18-6-2023 pullus: r-8M, r-8A & r-8B present together. With adult cachinnans parent.
25-6-2023 pullus: r-8M, r-8A & r-8B present together.

below: Caspian Gull cachinnans 8.B 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.B 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.B 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.