Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans 8.V 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring R-8.V and metal NLA 5.556.473, ringed as pullus Larus cachinnans on May 11 2023 in nest 108 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.
Birdv dead. Ring found at colony check on April 12 2024.

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 nest 108 74 49,7 92,03 68,2 49,8 85,16 69,7 48,6 82,89 260,08 same as 2022
ring pulli: 12-mei laying A egg: 7-april hatch A egg: 5-mei
     
catch: date: metal: darvic:            
pull 11-05-2023 NLA 5.556.472 r 8.P
pull 11-05-2023 NLA 5.556.473 r 8.V
pull 11-05-2023 NLA 5.556.474 r 8.4
pull 18-06-2023 NLA 5.556.472 r-8.P
pull 18-06-2023 NLA 5.556.474 r-8.4
nest 108
dam: dam 1 T-split
location: on W-part, border bitumen - blocks. Top of dam. Coded. Exact spot as in 2022, then r[C.S] (which was at almere dump + partner, on 23/4).
breeders: cach x cach
OBSERVATIONS:
09-04-2023 nest:  2 eggs measured. No watertest.
adult:  1x cachinnans unringed. Still not sure if r-CS is partner this season.
26-04-2023 adult: legs not visible. 
nest: 1,5 m NW is another nest, 2 eggs. LBBG? (on 27/4: yes, this is LBBG).
eggs: 3x egg, measured. No water test, ringing date known.
27-04-2023 adult: 5CY male cach. Unringed.
11-05-2023 pulli: 3 chicks ringed.
13-05-2023 adult partner 1 present.
18-06-2023 pulli: r-8P and r-84 present. Large chicks. 2x juveniles fledged. (r-8V dead in colony)
25-06-2023 pulli: r-8P present, other ring unreadable, probably r-8.4.

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