Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

Tibia ring R-8.H and metal NLA 5.556.467, ringed as pullus Larus cachinnans on May 11 2023 in nest 55 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 cach 55-2023 68,6 50,6 88,44 68,1 51,6 91,29 65,1 48,8 78,06 257,79 same as 2022
ring pulli: 12-mei laying A egg: 7-apr hatch A egg: 5-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 11-05-2023 NLA 5556466 r 8.W -- -- --
Pullus 11-05-2023 NLA 5556467 r 8.H -- -- --
Pullus 27-05-2023 NLA 5556466 r-8.W -- -- -- dead, 2 days ago.
Pullus 27-05-2023 NLA 5556467 r 8.H 758 -- -- not full of energy.
Pullus 18-06-2023 NLA 5556467 r-8.H 586 268 108,6 Looks very slim.
   
55-2023  
dam: dam 2 east
location: next to large boulder which is lookout post, on top of dam, close to yXCHP & yzMT
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult: 2 adult cach on lookout stone. 
09-04-2023 adult: 2 adult cach on lookout stone. 
nest: 2 eggs measured. No watertest, ring chicks in 1st session.
26-04-2023 nest: 3 eggs, all measured.
27-04-2023 nest: 3 eggs.
adult: 2 adults present.
11-05-2023 pulli: 2 chicks ringed, is there a 3rd chick?
13-05-2023 adult: female & male photographed, exactly same as in 2022.
18-05-2023 nest: nest empyt, no chicks found
27-05-2023 pulli: 1x dead chick is r-8.W, 2 days ago; 1x chick measured, a bit down, low in energy.
18-06-2023 pulli: r-8H present, looks very slim and not healthy. Fledging rate: 1 chick.

below: Caspian Gull cachinnans 8.H 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.H 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.