Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans T|2 1CY, June 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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Visits and data 2025 nest g-N|A (092).
| 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|A (092) | cach | cach | 74,6 | 48,8 | 70,2 | 48,8 | 70,3 | 47,8 | 3 | |||||
| dam: | dam 1 | |||||||||||||
| location: | underneath 'round' tree opposite pumping station, Red jerrycan on boulder at waterfront.
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| ouders: | new female, trapped art nest and ringed g-N|A.
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| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |
| 28-04-2025 | g-N|A | 5641010 | 92 | PONT | F | 4CY | 446 | 876 | 127,9 | 55,8 | 68,8 | 16,8 | 5,5 | |
| 25-05-2025 | g-T|2 | 5641856 | 92 | PONT | pullus | 114 | ringed pullus | |||||||
| 25-05-2025 | g-T|3 | 5641857 | 92 | PONT | pullus | 130 | ringed pullus | |||||||
| 25-05-2025 | 5641858 | 92 ?? | ?? | pullus | 56 | ringed pullus | ||||||||
| 09-06-2025 | G-T|2 | 5641856
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PONT | pullus | 464 | CONTROL | ||||||||
| 09-06-2025 | G-T|3 | 5641857
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PONT | pullus | 323 | CONTROL | ||||||||
OBSERVATIONS:
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| 25-03-2025 | nest | 2x cach present, 2024 was 2x 4cy cach.
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| 04-04 | nest | 2x cach present, Nest is really way underneath the bush.
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| 21-04 | nest | 1 egg, Not measured, Red jerrycan placed at boulder in front of nest.
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| 25-04 | nest | 2 eggs. | ||||||||||||
| 28-04 | adult | 3 eggs, adult trapped now g-N|A.
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| 08-05 | adult | both partners present.
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| 13-05 | nest | 3 eggs. | ||||||||||||
| adult | tried to trapped unringed male, but again female caught, and released.
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| food | vomit bolus is Roach.
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| 25-05 | chicks | 3x ringed, not sure if 3rd chick belongs to nest.
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| 30-05 | chicks | metal ringed chick found dead, metal ring reused.
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| 09-06 | chicks | 2 chicks found and measured.
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| 30-06-2025 | chicks | g-T|2 found dead, ring can be reused.
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| Conclusion: g-T|2 found dead & g-T|3 not seen after ringing, 3rd metal only (probably this nest) found dead. Likely failed season. | ||||||||||||||
Bird found dead in colony on June 30th, 2025. Ring will be used again, in July at the beach. See: g-T|2.
below: Caspian Gull cachinnans T|2 1CY, June 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
| 25-05-2025 | g-T|2 | 5641856 | 92 | PONT | pullus | 114 | ringed pullus | |||||||
| 09-06-2025 | g-T|2 | 5641856
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PONT | pullus | 464 | CONTROL | ||||||||
| 30-06-2025 | g-T|2 | g-T|2 found dead, ring can be reused.
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| Conclusion: g-T|2 found dead & g-T|3 not seen after ringing, 3rd metal only (probably this nest) found dead. Likely failed season. | ||||||||||||||
below: Caspian Gull cachinnans T|2 1CY, May 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
| 25-05-2025 | g-T|2 | 5641856 | 92 | PONT | pullus | 114 | ringed pullus | |||||||
| 09-06-2025 | g-T|2 | 5641856
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PONT | pullus | 464 | CONTROL | ||||||||
| 30-06-2025 | g-T|2 | g-T|2 found dead, ring can be reused.
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| Conclusion: g-T|2 found dead & g-T|3 not seen after ringing, 3rd metal only (probably this nest) found dead. Likely failed season. | ||||||||||||||
