Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans hybrid R|B 1CY, 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
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Tibia G-R|B and metal NLA 5.641.887, ringed as F1 pullus Larus cachinnans x Larus argentatus on May 31 2025 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team (Mars Muusse / Thijs Horst / Fred Cottaar).
Recoveries:
Visits and data 2025 for nest g-N|R & br-BJ (230).
| 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-N|R & br-BJ | cach | teus | 73,4 | 53,2 | 72,1 | 52,5 | 72,7 | 51 | 3 | |||||
| (230) | ||||||||||||||
| dam: | dam 2 west
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| location: | 3 m S of lighthouse, Was 230Z-2024
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| parents: | new, with Caspian Gull this season. Both partners trapped and ringed. Male 5CY Caspian is g-N|R. Female Herring Gull is b/r-JB. | |||||||||||||
| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |
| 28-04-2025 | b/r-JB | 6254497 | nest 230 | HERRING | F | >4CY | 428 | 895 | 110,8 | 48,1 | 65,6 | 18,6 | 5 | |
| 01-05-2025 | g-N|R | 6254558 | br-BJ (230) | PONT | M | >4CY | 453 | 1219 | 143,1 | 65,2 | 74,8 | 21,1 | 7 | 25B00657
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| 31-05-2025 | g-R|B | 5641887 | g-N|R & b/r-JB | HYBRID | pullus | 380 | 81,7 | |||||||
| 31-05-2025 | g-R|C | 5641888 | g-N|R & b/r-JB | HYBRID | pullus | 306 | 78 | |||||||
OBSERVATIONS:
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| 21-04-2025 | eggs | 1 egg. Assumed to be of Herring Gull, but proved wrong in the next week. Is Caspian.
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| 23-04-2025 | eggs | 2 eggs, measured.
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| adult | male 5CY cachinnans. Attempt to trap it. Failed.
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| 28-04-2025 | adult | male is 5CY cachinnans. Female is adult Herring Gull.
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| adult | trapped female HG, now b/r-JB. was Herring from nest nest 19-2024 at dam 1.
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| 01-05-2025 | adult | trapped 5CY male Caspian Gull, now g-N|R. | ||||||||||||
| 08-05-2025 | adult | both partners present.
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| 13-05-2025 | nest | 3x eggs. | ||||||||||||
| 31-05-2025 | nest | 2 chicks ringed, 3rd not found. Eventually, no chicks fledged in this nest.
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below: Caspian Gull cachinnans hybrid R|B 1CY, May 31 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
| date | darvic | metal | nest | species | sexe | age | wing | mass | head+ bill | bill | gonys | barcode | comments |
| 31-5-2025 | G-R|B | .5641887 | g-N|R & b/r-JB | HYBRID | pullus | 380 | 81,7 | Ringed pullus |
