Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Cachinnans - nest Lelystad 271
General remarks:
- Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
- Nest 271 positioned on dam 2 west section: 3 m W of nest 206, 10 m W of Blue Sign VHF20. Visible only from S side.
- In 2025 breeding birds at nest 271 is male Caspian Gull & female Caspian Gull 'thayeri'. Female in colony since at least 2020, new nest for the 4th time.
| location | April 21 2025: 3 eggs (full clutch). | April 21 2025: 3 eggs (full clutch). | . |
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| partner 1 | 2020-2021: female Caspian Gull thayeri at nest 029. | April 2022: female Caspian Gull thayeri at nest 135. | 2023-2024: female Caspian Gull thayeri at nest 112. |
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| partner 1 | April 12 2025: thayeri at nest 271. | April 12 2025: thayeri at nest 271. | April 25 2025: thayeri at nest 271. |
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| partner 1 | April 25 2025: thayeri at nest 271. | April 25 2025: thayeri at nest 271. | April 25 2025: thayeri at nest 271. |
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Data for nest 271-2025.
| 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 | |
| 271 thayeri | cach | cach | 73,6 | 51,6 | 73,2 | 52,4 | 70 | 51,5 | 3 | |||||
| dam: | dam 2 west
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| location: | 3 m W of 206, 10 m W of Blue Sign dam 2.
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| ouders: | new 2025, female thayeri now breeding here
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OBSERVATIONS:
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| 3/16/2025 | nest | thayeri present on bread. Not linked to nest location yet.
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| 4/12/2025 | nest | female 'thayeri' at location nest 31-2021. Next to blue sign VHF, dam 2W.
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| 4/21/2025 | nest | Thayeri at nest, alarming.
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| eggs | 3 eggs, measured.
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| 13-5-2025 | nest | no chicks found.
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