Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, May 2023 - April 2024, Lelystad & Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring G-8|R and metal NLA 5.625.281, ringed as pullus Larus cachinnans on May 18 2023 in nest 048 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

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 teus 48-2023 73,2 48,5 86,69 72,4 48,2 84,69 67,5 48,4 79,61 251,00 same as 2022
ring pulli: 20-mei laying A egg: 15-apr hatch A egg: 13-mei
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 27-5-2023 5.625.264 G-8|P 394 -- -- is nest 15B, full throat pouch with fish.
Pullus 27-5-2023 5.625.281 G-8|R 435 -- -- is nest 15B
Pullus 18-6-2023 5.625.281 G-8|R 918 301 113,0 hybrid type
   
48-2023 was 15B
dam: dam 2 central
location: Next to prunus, 1 mtr E of code 44 on blocks. 4 mtr from waterfront.
breeders: cach x teus
OBSERVATIONS:
09-4-2023 nest: no eggs, nest is ready.
26-4-2023 nest: 3 eggs measured, and water test: A: 80 - tip bottom
B: 80 - tip bottom
27-4-2023 adult: cach & teus, cach breeding. C: 90 - tip bottom
cach with patterns on P4.
11-5-2023 eggs floating - 5 mm.
27-5-2023 pulli: 2x chicks ringed and measured.
18-6-2023 pulli: 1x control of g-8|R, which is hybrid type. Fledged: 1x juvenile.
25-6-2023 pulli: G-8|R present.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 2CY, April 18 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|R 1CY, May 27 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.