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

Tibia ring R-8.T and metal NLA 5.556.470, ringed as pullus Larus cachinnans on May 11 2023 in nest 60 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.
ID certain for nest 60, both parents are Caspian Gull cachinnans.

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 60-2023 68,2 51 89,31 69,9 51 91,54 66,2 50,2 84,00 264,85 same as 2022
ring pulli: 11-mei laying A egg: 6-apr hatch A egg: 4-mei
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone: tarsus kor:
adult 03-5-2023 NLA 6214901 R-F.7 810? 447 125,6 57,5 18 6 female cach
pullus 11-5-2023 NLA 5556469 R-8.=
pullus 11-5-2023 NLA 5556470 R-8.T
pullus 11-5-2023 NLA 5556471 R-8.C
pullus 27-5-2023 NLA 5556469 R-8.= 872 109,3 45,8 14 72,8
 
60-2023
dam: dam 1 west
location: Is nest 60-2021/22. From cluster 60-62-63.
breeders: cach x cach
OBSERVATIONS:
09-04-2023 nest: 2 eggs measured. No watertest, ring chicks in 1st session.
22-04-2023 nest: 3 eggs measured.
03-05-2023 adult: Female partner ringed R-F.7.
11-05-2023 pulli: 3 chicks ringed.
13-05-2023 adult: both parents are cach.
18-05-2023 pulli: 3 chicks present.
27-05-2023 pulli: 1x control chick.
18-06-2023 adult: R-F7 guarding juveniles.
pulli: R-8= & R-8C present at water. At least 2x fledged.
25-06-2023 pulli: R-8=, R-8C and R-F7 (mother) present.

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