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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Herring Gull argenteus hybrid? 7|5 1CY, May - July 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring G-7|5 and metal NLA 5.556.424, ringed as pullus Larus argenteus on May 18 2023 in nest 63 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?
teus x ? 63-2023 73,7 51,3 97,66 72,5 52 98,71 70,1 50,5 90,01 286,37 same as 2022
ring pulli: May 22nd. laying A egg: April 17th. hatch A egg: May 15th.
 
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-05-2023 5556423 G-7|4 64 48
Pullus 18-05-2023 5556424 G-7|5 105 53
Pullus 18-05-2023 5556425 G-7|6 118 55
Pullus 18-06-2023 g-7|4 1137 263 115,8 HG type
Pullus 25-06-2023 G-7|4 1109 311 121,7
G-7|5 1039 326 124,1
G-7|6 896 325 114,3
 
63-2023
dam: dam 1 west
location: Is nest 63-2021/22. From cluster 60-62-63.
breeders: teus x ?
OBSERVATIONS:
09-04-2023 nest: no eggs, nest is ready.
22-04-2023 nest:  3 eggs, water test: bottom 40 degrees, bottom 30 degrees, bottom flat.
18-05-2023 pullus 3 chicks ringed
18-06-2023 pullus 1x control: g-7|4 is Herring type, 32 days old.
25-06-2023 pullus 3x chicks fledged

below: Herring Gull argenteus hybrid? 7|5 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argenteus hybrid? 7|5 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argenteus hybrid? 7|5 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.