Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans A|G adult, April 2024 - March 2025, Lelystad & Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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Tibia ring G-A|G and metal NLA 5.625.296, ringed as breeding adult Larus cachinnans (type / hybrid) on April 30 2024 in nest 038-2024 at Lelystad, the Netherlands. Ringed by Mars Muusse (Roland-Jan Buijs ringing team).
Recoveries:
17-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
29-06-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
11-12-2024 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
13-12-2024 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Jaap van der Linden
03-01-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
30-01-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
12-02-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
25-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
12-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
25-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
29-06-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
30-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
Visits and data 2024
| NEST code | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | |
| g-A|G (038) | cach | 70,3 | 53,3 | 100,56 | 68,4 | 51 | 89,58 | 70,6 | 52,8 | 99,10 | 289,23 | ||
| 2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 11-4-2024 | 9-5-2024 | |||||||||||
| dam: | dam 2 east of T-split | ||||||||||||
| location: | Is 38-2023: 200 mtr E of T-split, on top of tarmac two large boulders, west one is lookout post. | ||||||||||||
| parents? | same as 2022, 2023. In 2024 female trapped:g-A|G | ||||||||||||
| ring pulli: | 14-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | 30-4-2024 | g-A|G | .5625296 | Dam 2 soos nest | PONT | F | >4CY | 424 | 1002 | 125,7 | 53,5 | 68,3 | 19 | 7 |
| OBSERVATIONS: | |||||||||||||
| 12-4-2024 | eggs: | 1 egg, measured. | |||||||||||
| 21-4-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 30-4-2024 | adults: | trapped female Caspian Gull, incubating 3 eggs. Now g-A|G. | |||||||||||
Visits and data 2025.
| 2025 | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST:
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# eggs |
| g-A|G (038) | cach | cach | 72,7 | 52,5 | 70 | 52 | 67,1 | 51,8 | 3 | ||||
| dam: | dam 2 east of T-split
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| location: | is 38-2023: 200 mtr E of T-split, on top of tarmac two large boulders, west one is lookout post,
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| parents: | same as 2022-2024, one is g-A|G
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| ringed: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | |
| 28-04-2025 | g-A|G | CONTROL | |||||||||||
| 25-05-2025 | g-T|Z | 5641853 | 38 | PONT | pullus | 364 | 77,2 | ||||||
| 25-05-2025 | g-T|0 | 5641854 | 38 | PONT | pullus | 506 | 86,3 | ||||||
| 09-06-2025 | g-T|0 | 865 | |||||||||||
| 09-06-2025 | g-T|Z | 775 | |||||||||||
| 14-06-2025 | G-T|Z | dam 2 WATER | PONT | pullus | 259 | 803 | |||||||
| 14-06-2025 | G-T|0 | dam 2 WATER | PONT | pullus | 294 | 953 | |||||||
OBSERVATIONS:
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| 16-03-2025 | nest | g-A|G & partner at location 2024 (nest 38, dam 2)
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| 25-03 | nest | g-A|G & partner at location 2024 (nest 38, dam 2)
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| 04-04 | nest | g-A|G & partner at location 2024 (nest 38, dam 2)
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| 21-04 | eggs | 3x eggs measured
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| 23-04 | adult | attempt to trap unringed adult, Failed.
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| 28-04 | adult | attempted to catch female cachinnans, caught g-A|G swabbed for flu
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| 13-05-2025 | chicks | 1 chick, 2 eggs hatching
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| 25-05-2025 | chicks | 2 chicks ringed, 3rd??
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| 09-06-2025 | chicks | 2 chicks found and measured, probably no 3rd chick
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| 14-06-2025 | chicks | 2 chicks caught on water, probably 2 chicks this year
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below: Caspian Gull cachinnans A|G adult, April 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
| date | darvic | metal | nest | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | barcode | greyscale | comments | 28-4-2025 | G-A|G | PONT | 25B00549 | Trapped by ringer. Breeder on 3 eggs. |
below: Caspian Gull cachinnans A|G adult, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Caspian Gull g-A|G with partner together present today at same location as 2024: Dam 2 east. Interestingly, two extra Caspians here too, but chased away from look-out stone.
below: Caspian Gull cachinnans A|G adult, January 30 2025, Almere - de Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|G adult, June 29 2024, Lelystad colony, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|G adult, April 30 2024, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 30-4-2024 | g-A|G | .5625296 | Dam 2 soos nest | PONT | F | >4CY | 424 | 1002 | 125,7 | 53,5 | 68,3 | 19 | 7 |
