Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Cachinnans - nest Lelystad g-A|B & y-0:B (223)
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 223 positioned high on breakwater dam 2 at the north side, 5 meters north of nest 17, and 3 mtr east of nest y-X60J-2024.
- ID certain in 2022, see yX540-2022.
- In 2024: certain. Female is cachinnans. Male is cachinnans, ringed this season g-A|B.
- In 2025: same pair, same location. White football placed next to nest.
- In 2026: same pair. male is g-A|B. Same female, in 2026 ringed y-0:B. Nest moved 10 mtr NE direction, N-side of dam 2, now close to nest 17B.
| nest | April 21 2025: 3 eggs (full clutch) | April 21 2025: 3 eggs (full clutch) | April 22 2026: 3 eggs (full clutch) |
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| nest | April 22 2026: 3 eggs (full clutch) | . | . |
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| partner 1 | April 26th, 2024: male cachinnans g-A|B. | April 26th, 2024: male cachinnans g-A|B. | April 26th, 2024: male cachinnans g-A|B. |
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| partner 1 | July 15 2024: hinnans g-A|B & chick g-C|7. | March 21 2025: male cachinnans g-A|B. | March 21 2025: male cachinnans g-A|B. |
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| partner 2 | April 23rd, 2024: female cachinnans. | April 23rd, 2024: female cachinnans. | April 12 2025: female Caspian Gull. |
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| chick | May 31 2024: chick g-C|7. | May 31 2024: chick g-R|K. | . |
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| food: | April 21st, 2022: Greylag Goose on the menu. | . | |
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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 | 50,3 | 98,85 | 0,00 | 0,00 | 98,85 | ||||||
| 223-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 1 | 21-4-2024 | 19-5-2024 | |||||||||||
| dam: | dam 2 central | ||||||||||||
| location: | 223-2022, 3 mtr north of 17, 3 mtr east of 253 | ||||||||||||
| parents? | Same as 2022? | ||||||||||||
| ring pulli: | 25-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | 26-04-2024 | g-A|B | .5625287 | nest 223 dam 2 | PONT | M | >4CY | 475 | 1280 | 140,7 | 64,4 | 78,2 | 20,0 | 7 |
| 31-05-2024 | g-C|7 | .5631131 | g-A|B nest 223 | PONT | 1CY | ||||||||
| 04-06-2024 | g-C|7 | .5631131 | g-A|B nest 223 | PONT | 1CY | 100 | 485 | 84,2 | |||||
| OBSERVATIONS: | |||||||||||||
| 21-04-2024 | eggs: | 1 egg, measured. | |||||||||||
| food: | Greylag Goose chicks: 14 legs | ||||||||||||
| 26-04-2024 | adult: | adult male trapped at nest, now g-A|B. | |||||||||||
| 07-05-2024 | nest: | 3 eggs. | |||||||||||
| 14-05-2024 | nest: | 3 eggs. | |||||||||||
| 31-05-2024 | chicks: | 1x ringed. | |||||||||||
| 04-06-2024 | chicks: | g-C|7 present, measured. | |||||||||||
Visits and data nest g-A|B (223-2025).
| 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 |
| g-A|B (223) | cach | cach | 80,3 | 50,9 | 75,8 | 50,4 | 72,7 | 48,4 | 3 | ||||
| dam: | dam 2 central
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| location: | 3 mtr north of 17, 3 mtr east of 253. White football.
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| parents: | Male is g-A|B, female is adult Caspian Gull. | ||||||||||||
| ring pulli: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | |
| 31-05-2025 | g-R|K | 5641901 | g-A|B | PONT | pullus | 413 | |||||||
OBSERVATIONS:
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| 3/16/2025 | nest | g-A|B and several cach present at blocks near nest 223/253
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| 3/20/2025 | nest | g-A|B at nest location 2024
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| 4/12/2025 | nest | g-A|B and unringed partner at nest location 2024
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| 4/21/2025 | eggs | 3x eggs measured
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| 5/8/2025 | adult | both partners present
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| 5/31/2025 | chicks | 1 chick ringed, might be alerting above water where we ringed 4 chicks
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Visits and data nest g-A|B & y-0:B (2026).
| 2026 | 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|B & y-0:B | cach | cach | 74,4 | 50,7 | 73,6 | 51,7 | 71,0 | 48,3 | ||||||
| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | tarsus | head+ bill | bill | gonys | mass | barcode | |
| 27-04-2026 | y-0:B | .5641190 | Nest g-A|B | PONT | F | >4CY | 449 | 69,1 | 122,7 | 57,6 | 18,2 | 820 | 26B02659 | |
OBSERVATIONS:
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| 22-04-2026 | nest | 3 eggs, measured. Nest is 6 mtr W of 17B, on N-side of dam 2. | ||||||||||||
| 26-04-2026 | nest | 3 eggs. | ||||||||||||
| 27-04-2026 | parents | Trapped female, now y-0:4. |
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