Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans hybrid 7|3 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

Green tibia ring r[7|3] and metal NLA 5.556.422, ringed as pullus Larus cachinnans hybrid at nest 62 on May 03 2023 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID uncertain for nest 62. Difficult to monitor exact relations in this cluster of nests.

Recoveries:
18-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
02-07-2024 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 ? 62-2023 70,1 51,2 92,52 70,3 51,8 94,98 67,9 51,7 91,38 278,88 same as 2022
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
adult 03-05-2023 6214904 r-7.L nn 466 136 59,7 21,6 6 female cach
pullus 18-05-2023 5556422 G-7|3 116 52,6
 
62-2023
dam: dam 1 west
location: Is nest 62-2021/22. From cluster 60-62-63.
breeders: cach x ?
OBSERVATIONS:
09-04-2023 nest: no eggs, nest is ready.
22-04-2023 nest: 3 eggs, water test = tip bottom 90 degrees; tip bottom 50 degrees, tip bottom 45 degrees.
03-05-2023 adult: trapped female cach: r-7.L.
eggs: 3 eggs.
18-05-2023 eggs: 1 rotten egg.
  pullus: 1 chick ringed is G-7|3, 1 chick dead in nest.

below: Caspian Gull cachinnans hybrid 7|3 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.