Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans 8.K 1CY, May - June 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring R-8.K and metal NLA 5.556.468, ringed as pullus Larus cachinnans on May 18 2023 in nest 038 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 hybrid 38-2023 69 50 86,85 68,6 52 93,40 67,8 51,9 91,95 272,20 same as 2022
ring pulli: 14-mei laying A egg: 11-apr hatch A egg: 9-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 11-5-2023 NLA 5.556.468 R-8.K (on 18-5) 235 (on 18-5) 67
Pullus 18-5-2023 NLA 5.556.421 G-7|2 152 59,8
Pullus 18-6-2023 NLA 5.556.468 R-8.K 1077 328 122,4
Pullus 18-6-2023 NLA 5.556.421 G-7|2 887 311 112,7
 
38-2023
dam: dam 2 east of T-split
location: 2 large boulders, west one is lookout post, 200 mtr E of T-split, on top of tarmac. Red flag at N-side between blocks.
breeders: cach x river gull
OBSERVATIONS:
09-4-2023 2 adults cach type & river gull type on lookout. No eggs, but nest is ready.
26-4-2023 eggs: 3x egg, measured. Water test: A: floating - halfway
B: 80 - tip bottom
C: floating - 1mm
11-5-2023 pulli: 1 chick ringed, 1 egg hatching, 3rd egg still complete.
18-5-2023 pulli: 2 chicks present (R-8K and unringed one, which is now ringed) 1 rotten egg.
18-6-2023 pulli: 2x fledged from nest (1x rotten egg).
25-6-2023 pulli: r-8K present.

below: Caspian Gull cachinnans 8.K 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.K 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.