Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Herring Gull argenteus hybrid 7|X 1CY-2CY, May 2023 - september 2024, the Netherlands. Picture: Annelies Marijnis, Thijs Horst & Mars Muusse.

Tibia ring G-7|X and metal NLA 5.556.415, ringed as pullus Larus argentatus hybrid on May 18 2023 in nest 44 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.
Mother is Herring Gull, father is "River Gull" (indications for Yellow-legged x Herring Gull).

Recoveries:
18-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
27-05-2023 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
23-11-2023 Wissant (Strand), Pas-de-Calais, Frankrijk 5.053,00 N 140,00 E colourring read Jan Talloen
31-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
03-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland & Thijs Horst
04-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland & Jan Zorgdrager
05-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
06-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
07-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
12-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
13-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
16-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
18-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
19-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
20-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
01-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
04-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
28-02-2024 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
01-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
05-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Jan Zorgdrager
09-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read M. Loeve & M. Muusse
21-04-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
09-05-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
12-09-2024 Katwijk aan Zee (Strand), Zuid-Holland, NL 5.213,00 N 424,00 E found dead Annelies Marijnis

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?
hybrid x teus 44-2023 68 51,3 90,10 67,6 51,2 89,22 66,7 50,6 85,99 265,31 same as 2022
ring pulli: 25-mei laying A egg: 20-apr hatch A egg: 18-mei
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-5-2023 5.556.414 g-7|W 68 -- 50
Pullus 18-5-2023 5.556.415 g-7|X 46 -- 49
Pullus 18-5-2023 5.556.416 nn 48 -- 46,1
Pullus 27-5-2023 5.556.415 g-7|X 328 -- --
Pullus 27-5-2023 5.556.416 g-8|N 227 -- --
Pullus 18-6-2023 5.556.415 g-7|X 975 280 113,3 hybrid / Herring
Pullus 25-6-2023 5.556.416 g-8|N 870 286 105,9 hybrid / Herring
Pullus 25-6-2023 5.556.415 g-7|X 982 330 119,2 hybrid / Herring
   
44-2023 nest achter de prunus
dam: dam 2 central
location: Is nest 44-2022. 20 mtr E of nest 14, behind trees.
breeders: River Gull-type (hybrid) x argenteus
OBSERVATIONS:
04-4-2023 adult: 2 adults at nest site.
09-4-2023 nest: no eggs, nest is ready.
26-4-2023 nest: 3 eggs measured, and water test: A: 50 - tip bottom
B: 30 - tip bottom
C: 40 - tip bottom
11-5-2023 nest 3 eggs.
18-5-2023 pulli: 3x chicks ringed. 2x colour rings, 1x metal (too small for darvic ring).
27-5-2023 pulli: 2x chick measured, 1x extra colour ring g-8|N.
18-6-2023 pulli: swimming: G-7|X trapped. Measured. Herring Gull-type wing pattern.
25-6-2023 pulli: 2 chicks swimming g-7|X and g-8|N. Fledged: 2x juveniles.

below: Herring Gull argenteus hybrid 7|X 2CY, September 12 2024, Katwijk aan Zee, the Netherlands. Picture: Annelies Marijnis.

Found dead.

below: Herring Gull argenteus hybrid 7|X 2CY, May 09 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.

below: Herring Gull argenteus hybrid 7|X 2CY, April 09 2024, Almere - De Vaart, the Netherlands. Picture: Mars Muusse.

below: Herring Gull argenteus hybrid 7|X 2CY, February 01 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.

below: Herring Gull argenteus hybrid 7|X 2CY, January 16 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argenteus hybrid 7|X 2CY, January 03 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.

below: Herring Gull argenteus hybrid 7|X 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argenteus hybrid 7|X 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argenteus hybrid 7|X 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.