Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans 7|J 1CY, May - September 2023, the Netherlands. Picture: Leon Kelder, Casper Swiebel, Thijs Horst & Mars Muusse.

Tibia ring G-7|J and metal NLA 5.556.401, ringed as pullus Larus cachinnans on May 18 2023 in nest 139 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
09-08-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
22-09-2023 Almere (Oostvaardersplassen), Flevoland, NL 5.226,00 N 517,00 E colourring read Casper Swiebel

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 139 74,2 51 97,17 74,2 49,7 92,28 72,7 50,7 94,09 283,55 same as 2022
ring pulli: May 12. laying A egg: April 7. hatch A egg: May 5.
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
Pullus 18-5-2023 5556401 G-7|J 161 -- 66 --
Pullus 18-5-2023 5556402 G-7|K 116 -- 57,4 --
 
139-2023
dam: dam 1 east
location: easternmost nest with yellow/black flag. On N side with red/white foam.
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult:  1x cachinnans guarding and at nest
09-04-2023 nest:  no eggs, nest is ready. Y/B flag near nest.
adult:  1x cachinnans guarding and at nest
26-04-2023 adult:  breeding cachinnans
eggs: 3x egg, measured A 80 - punt bodem
B 60 - punt bodem
C 90 - punt bodem
13-05-2023 adult: male and female are cachinnans.
18-05-2023 pulli: 2 chicks ringed, 3rd not found
27-05-2023 pulli: dense vegetation, nothing found.
25-06-2023 pulli: g-7|K and g-7|J present

below: Caspian Gull cachinnans 7|J 1CY, September 22 2023, Almere, the Netherlands. Picture: Casper Swiebel.

below: Caspian Gull cachinnans 7|J 1CY, September 11 2023, Wervershoof, the Netherlands. Picture: Leon Kelder.

below: Caspian Gull cachinnans 7|J 1CY, August 09 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7|J 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.