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 g-R|T & b/r-JV in 2025.
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).
- Location on breakwater dam 1 blocks, 1 meter above + sign (sprayed on block), 2 mtr E of nest 53. Cluster of nests between blocks.
- ID certain in 2025. 4CY male Caspian Gull, in 2025 ringed g-R|T. Adult female Herring Gull, in 2025 ringed b/r-JV.
| location | April 28th, 2025: Caspian & Herring at nest. | April 28th, 2025: Caspian & Herring at nest. | . |
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| partner 1 | May 31 2025: adult female Herring Gull, ringed b/r-JV. | May 31 2025: adult female Herring Gull, ringed b/r-JV. | May 31 2025: adult female Herring Gull, ringed b/r-JV. |
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| partner 2 | May 31 2025: 4CY male Caspian Gull, ringed g-R|T. | May 31 2025: 4CY male Caspian Gull, ringed g-R|T. | May 31 2025: 4CY male Caspian Gull, ringed g-R|T. |
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Data for nest g-R|T & b/r-JV 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: | |
| g-R|T & b/r-JV | cach | teus | |||||||||||
| dam: | dam 1, blocks | ||||||||||||
| location: | blocks north side, 1m above + sign on dam, 2 mtr E of nest 53.
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| parents: | New, mixed couple. Both trapped in 2025: 4CY Caspian male is now g-R|T. Adult female Herring is now b/r-JV. | ||||||||||||
| ringed: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 31-05-2025 | b/r-JV | 6254570 | Nest with + on blocks dam 1 | ZM | F | >4CY | 407 | 730 | 112,6 | 50,8 | 65,2 | 18,3 | 5 |
| 31-05-2025 | g-R|T | 5641915 | Nest with + on blocks dam 1 | PONT | M | 4CY | 459 | 1029 | 141 | 62,2 | 67 | 18,8 | 7 |
| OBSERVATIONS: | |||||||||||||
| 31-05-2025 | adult | Adult female trapped at nest, now b/r-JV and adult male g-R|T.
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| eggs | 2x eggs. | ||||||||||||
| 14-06-2025 | nest | nest failed. | |||||||||||