Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans A|E adult, 2024-2025, the Netherlands. Picture: Neil Kampherbeek, Bert Jonkhans, Thijs Horst & Mars Muusse.
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Tibia ring G-A|E and metal NLA 5.625.294, ringed as breeding adult female Larus cachinnans on April 26 2024 in nest yPAM0-gAE at Lelystad, the Netherlands. Ringed by Mars Muusse (Roland-Jan Buijs ringing team).
Remarks: Partner male Y[P:AM0] in 2024.
Recoveries:
05-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
21-11-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
23-12-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
03-01-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
28-01-2025 Almere (Oostvaardersplassen), Flevoland, NL 5.226,00 N 517,00 E colourring read Colin Aalbers
09-02-2025 Lelystad (Oostvaardersplassen), Flevoland, NL 5.227,00 N 524,00 E colourring read Joost van der Sluijs, Neil Kampherbeek, Rick Geling
13-02-2025 Lelystad (Oostvaardersplassen), Flevoland, NL 5.227,00 N 524,00 E colourring read Bert Jonkhans
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
21-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
23-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Horst, Muusse(s) & Cottaar
04-06-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
10-06-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
09-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
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: | |
| P:AM0 & g-A|E | cach | cach | 73,6 | 49 | 88,98 | 70 | 50,3 | 89,17 | 68,5 | 48,5 | 81,13 | 259,28 | |
| 2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 10-4-2024 | 6-5-2024 | |||||||||||
| dam: | dam 1 west | ||||||||||||
| location: | Is nest 63-2021/2023. The west nest in the complex. | ||||||||||||
| parents? | y-P:AM0 is new breeder. | ||||||||||||
| ring pulli: | 11-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | 26-4-2024 | g-A|E | .5625294 | nest PAM0 | PONT | F | >4CY | 443 | 1075 | 126,3 | 53,0 | 66,7 | 18,1 | 5 |
| OBSERVATIONS: | |||||||||||||
| 8-3-2024 | adult: | y-PAM0. | |||||||||||
| 31-3-2024 | adults: | both parents present. | |||||||||||
| 12-4-2024 | eggs: | 1 egg, measured. | |||||||||||
| 21-4-2024 | eggs: | 3, measured. | |||||||||||
| nest: | cluster again: 60, 69, PAM0, n-F|+, and 2 Herrings to follow soon. | ||||||||||||
| 26-4-2024 | adult: | adult female trapped at nest, now g-A|E. | |||||||||||
| food: | Perch vomit when adult trapped. | ||||||||||||
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 A|E adult, December 02 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|E adult, July 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
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below: Caspian Gull cachinnans A|E adult, June 10 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|E adult, June 04 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
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below: Caspian Gull cachinnans A|E adult, April 28 2025, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Female g-A|E not with y-PAM0 this year. Instead, she moved to male Caspian Gull in nest r-CG. Female r-CG no longer the favorite for this male, which we ringed this year, now g-M|+.
below: Caspian Gull cachinnans A|E adult, April 10 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
Now with ex-partner r-CG from 2024. Under tree at r-CG nest location. Where is r-CG?
below: Caspian Gull cachinnans A|E adult, March 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans A|E adult, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Back in the colony. Partner 2024 y-P:AM0 not present today.
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below: Caspian Gull cachinnans A|E adult, February 13 2025, Lelystad, the Netherlands. Picture: Bert Jonkhans.
below: Caspian Gull cachinnans A|E adult, February 09 2025, Lelystad, the Netherlands. Picture: Neil Kampherbeek.
below: Caspian Gull cachinnans A|E adult, January 03 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|E adult, December 23 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|E adult, November 21 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans A|E adult, April 26 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 |
| 26-4-2024 | g-A|E | .5625294 | nest PAM0 dam 1 | PONT | F | >4CY | 443 | 1075 | 126,3 | 53,0 | 66,7 | 18,1 | 5 |
