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-N|B (022-2025)
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).
- In 2024: nest 022 positioned on artificial breakwater 1 at T-split. Location is "Nest with Black Shoe", 7 mtr east of nest 21.
- In 2025: exactly same location, still with the black shoe.
- Uncertainty on ID in 2024, female is Caspian Gull cachinnans. Male not photographed.
- Certain ID in 2025. Both are Caspian Gull cachinnans. Female is same as 2024, ringed in 2025, now g-N|B.
| nest | April 12th, 2024: full clutch (3 eggs). | April 12th, 2024: full clutch (3 eggs). | April 23 2025: 3 eggs (full clutch). |
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| partner 1 | May 14 2024: female Caspian Gull at nest. | May 14 2024: female Caspian Gull adult. | April 28th, 2025: female Caspian Gull g-N|B. |
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| partner 1 | April 28th, 2025: female Caspian Gull g-N|B. | . | . |
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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: | |
| cach | cach | 77,6 | 50,7 | 100,43 | 75,6 | 50 | 95,16 | 75,3 | 51,5 | 100,56 | 296,15 | ||
| 022-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 8-4-2024 | 15-5-2024 | |||||||||||
| dam: | dam 1 T-split | ||||||||||||
| location: | Nest "black shoe". 4 mtr east of nest 21. | ||||||||||||
| parents? | New | ||||||||||||
| ring pulli: | 09-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| OBSERVATIONS: | |||||||||||||
| 12-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, not measured. | |||||||||||
| 02-05-2024 | eggs: | 3 eggs. | |||||||||||
| 07-05-2024 | eggs: | 3x. | |||||||||||
| 14-05-2024 | eggs: | 3x, hatching tomorrow. Note: long incubation period! | |||||||||||
| adult: | 1x Caspian Gull at nest. | ||||||||||||
| 31-05-2024 | nest: | seems abandoned. | |||||||||||
| 04-06-2024 | nest: | seems abandoned; failed season 2024. | |||||||||||
Visits and data 2025 nest g-N|B (022).
| 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: | # eggs | |
g-N|B (022)
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cach | cach | 76 | 50,3 | 71,5 | 51,4 | 71,7 | 50,9 | 3 | |||||
| dam: | dam 1 T-split | |||||||||||||
| location: | 22 is nest "black shoe", 5 mtr E of nest 21 'de oksel'.
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| parents: | same as 2024. This season trapped the female, now g-N|B. | |||||||||||||
| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale
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| 4/28/2025 | g-N|B | 5641011 | 22 | PONT | F | >4CY | 453 | 901 | 121,1 | 56,1 | 67,9 | 17,2 | 7 | |
| OBSERVATIONS: | ||||||||||||||
| 4/23/2025 | eggs | 3 eggs, measured
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| 4/28/2025 | nest | 1 egg rotten, adult female trapped now g-N|B
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| food | bream/roach | |||||||||||||
| 5/1/2025 | adult | g-N|B present | ||||||||||||
| 13/5/2025 | nest | 2 eggs | ||||||||||||
| 31-5-2025 | nest | nest looks failed, 1 egg and broken egg, Might have started again 2m below with 3 eggs.
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