Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans M|+ adult, 2025, colony Lelystad, the Netherlands.
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Tibia G-M|+ and metal NLA 6.254.496, ringed as breeding adult Larus cachinnans on April 28 2025 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team (Mars Muusse / Thijs Horst).
Recoveries:
09-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
Visits and data 2025 for nest g-A|E & g-M|+.
| 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|E | cach | cach | 73,4 | 48,5 | 70 | 49,7 | 69,2 | 50 | 3 | ||||
| dam: | dam 1 centraal | ||||||||||||
| location: | dam 1, was nest r-CG 2024, under tree.
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| parents: | in 2025: ex male r-CG 2024, female is g-A|E (female partner of PAM0 in 2024).
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| ringed: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | |
| 28-04-2025 | g-M|+ | 6254496 | nest g-A|E | PONT | M | >4CY | 470 | 1260 | 140,7 | 64,4 | 78,1 | 20,1 | |
| 13-05 | g-N|X | 5641026 | g-A|E & g-M|+ | PONT | pullus | 218 | |||||||
| 13-05 | g-N|Y | 5641027 | g-A|E & g-M|+ | PONT | pullus | 191 | |||||||
| 13-05 | g-N|Z | 5641028 | g-A|E & g-M|+ | PONT | pullus | 240 | |||||||
| 09-06 | G-N|X | 5641026 | PONT | pullus | 850 | CONTROL | |||||||
| 09-06 | G-N|Y | 5641027 | PONT | pullus | 950 | CONTROL | |||||||
| OBSERVATIONS: | |||||||||||||
| 10-04-2025 | parents: | at nest: g-A|E female cachinnans. Also unringed cachinnans, which was male partner of r-CG in 2024 at this location.
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| Where is cachinnans r-CG which was the female at this nest over the last years? Observed with few new male partners, with hybrid r-6X lately. | |||||||||||||
| Conclusion: male of r-CG (in 2024) remained at nest location, now bonding with g-A|E, ex-female of y-P:AM0 (2024). R-CG is alive and searching. | |||||||||||||
| 21-04 | nest: | measured 3 eggs.
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| adult: | unringed male attacks.
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| 23-04 | adult: | attempt to trap unringed male. Failed.
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| 28-04 | adult: | trapped adult male cachinnans, now g-M|+. Pictures compared: is male 2024 in this nest.
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| 13-05 | pullus | 3x pullus ringed.
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| 09-06 | chicks | 3x pullus on water, 2 caught and measured, 3rd escaped.
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below: Caspian Gull cachinnans M|+ adult, April 28 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 | ringer |
| 28-4-2025 | G-M|+ | .6254496 | g-A|E | PONT | M | >4CY | 470 | 1260 | 140,7 | 64,4 | 78,1 | 20,1 | 25B00554 | Trapped by ringer. Breeder on 3 eggs. | Mars Muusse |
