Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Caspian Gull cachinnans 7.N adult, 2023 - 2025, Marker Wadden & Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Red tibia ring r[7.N] and metal NLA 6.214.906, ringed as breeding female Larus cachinnans at nest n-F|N on May 03 2023 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain for nest n-F|N, both parents are Caspian Gull cachinnans: male n-F|N and female r-7.N. Although, maybe n-F|N has some hybrid traits.
Recoveries:
26-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
19-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
26-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
30-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Harry Kuipers & Thijs Horst
31-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
08-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
21-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
18-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
23-08-2024 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
20-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
01-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
04-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
21-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
09-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
| 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 | nFN & r7N | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0,00 | same as 2022 |
| ring pulli: -- | laying A egg: -- | hatch A egg: -- | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | bill: | gonys: | greytone: | |||
| adult | 03-05-2023 | 6.214.906 | R-7.N | -- | 433 | 123,7 | 52,6 | 18,4 | 6 | female cach | ||
| pullus: | 18-05-2023 | 5.556.488 | R-8.F | 256 | -- | 65,4 | -- | -- | -- | |||
| pullus: | 18-05-2023 | 5.556.489 | R-8.J | 224 | -- | 70 | -- | -- | -- | |||
| pullus: | 27-05-2023 | 5.556.488 | R-8.F | 643 | -- | -- | -- | -- | -- | |||
| pullus: | 18-06-2023 | 5.556.489 | r-8.J | 1020 | 341 | 126,8 | -- | -- | -- | with sibling | ||
| n-F|N & r-7.N | |||
| dam: | dam 1 west | ||
| location: | Is nest n-F|N-2022. Nest 2023 is 3 mtr further N now, closer to Herring Gull w-8Z. | ||
| breeders: | cach x cach | ||
| OBSERVATIONS: | |||
| 04-04-2023 | adult: | n-F|N at nest location. | |
| 09-04-2023 | nest: | no eggs, but nest ready. | |
| adult: | Male is n-F|N, female is cach unringed. | ||
| 27-04-2023 | adult: | Male is n-F|N, female is cach unringed. | |
| 03-05-2023 | adult: | Trapped unringed female at nest: r-7N. | |
| 13-05-2023 | adult: | Both parents present. | |
| 18-05-2023 | pulli: | 2 chicks ringed, 3rd one not found. | |
| 27-05-2023 | pulli: | 1x control chick. | |
| 18-06-2023 | pulli: | r-8J & r-8F present. Probably no 3rd chick. Fledged: 2 juveniles. | |
| 25-06-2023 | pulli: | r-8J & r-8F present. Both parents as well. | |
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: | |
| n-F|N & r-7.N | cach | cach | 75 | 47,3 | 84,49 | 72 | 48,5 | 85,27 | 71,8 | 51,1 | 94,40 | 264,16 | |
| 2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 8-4-2024 | 4-5-2024 | |||||||||||
| dam: | dam 1 west | ||||||||||||
| location: | Is nest nFN-2023, near Blackberry, close to w-8Z. | ||||||||||||
| parents? | same as 2022, 2023: male n-F|N & female r-7.N | ||||||||||||
| ring pulli: | 09-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| OBSERVATIONS: | |||||||||||||
| 19-03-2024 | adult: | n-F|N & r-7.N present at nest. | |||||||||||
| 12-04-2024 | eggs: | 3, measured. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, not measured. | |||||||||||
| 05-05-2024 | nest: | 2 eggs, 1 chick 1 day old, not ringed. | |||||||||||
| 14-05-2024 | nest: | empty nest, no chicks found. | |||||||||||
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 | |
| n-F|N & r-7N | cach n-F|N | cach r-7N | 75,1 | 49,8 | 74,7 | 50,2 | 68,3 | 48,4 | 3 | |||||
| dam: | dam 1 west
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| location: | was nest n-F|N in 2022-2024, East of Blackberry.
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| parents: | same as 2024
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| ringed: | ||||||||||||||
| date: | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |
| 25-05-2025 | g-T|5 | 5641861 | n-F|N & r-7N | PONT | pullus | 592 | ringed pullus
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| 25-05-2025 | g-T|6 | 5641862 | n-F|N & r-7N | PONT | pullus | 642 | ringed pullus
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| 31-05-2025 | g-R|Y | 5641920 | n-F|N & r-7N | PONT | pullus | 758 | 99 | ringed pullus
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OBSERVATIONS:
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| 16-03-2025 | nest | |||||||||||||
| 20-03 | nest | both partners present near nest location
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| 25-03 | nest | n-F|N present at nest location
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| 01-04 | nest | both partners present near nest location
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| 04-04 | nest | both partners present near nest location
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| 21-04 | eggs | 3x eggs measured,
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| 23-04 | nest | both partners present near nest location
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| 28-04 | eggs | 3 eggs | ||||||||||||
| 01-05 | eggs | 3 eggs | ||||||||||||
| 25-05 | nest | 2 chicks ringed, 3rd ran away into water.
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| 31-05 | chicks | 3rd chick ringed, other 2 also present
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below: Caspian Gull cachinnans 7.N adult, July 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
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below: Caspian Gull cachinnans 7.N adult, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.N adult, March 26 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.N adult, March 19 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.N adult, July 08 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.N adult, June 25 2023, Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.N adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
