Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans NLA 5.556.413 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

Metal NLA 5.556.413, ringed as pullus Larus cachinnans on May 18 2023 in nest 262 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 ? 262-2023 67,3 48,1 78,40 67,6 47,3 76,15 64,9 48 75,29 229,84 NEW NEST
ring pulli: May 25 laying A egg: April 20 hatch A egg: May 18
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-05-2023 5.556.412 64 48,9
Pullus 18-05-2023 5.556.413 52 47
   
262-2023 was approx nest 18-2021
dam: dam 2 central
location: old location of 18, but slightly more north. 10 mtr W of 14, on N side. Code sprayed.
breeders: cach x ?
OBSERVATIONS:
30-04-2023 nest: 3 eggs. Measured & water test: A 90 - tip bottom
adult: 2 adults present. B 70 - tip bottom
C 80 - tip bottom
11-05-2023 eggs 3x
18-05-2023 pulli: 2 chicks ringed, 1 egg hatching. Metal only, too small
27-05-2023 pulli: 1x dead unringed chick in nest.
18-05-2023 pulli: saw 2 juvenile birds with metal only during the day around this location. Could be the 2 fledged chicks, or the same bird twice.

below: Caspian Gull cachinnans NLA 5.556.413 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.