Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans hybrid R|X 1CY, 2025, the Netherlands. Picture: Merijn Loeve, Mars Muusse & Thijs Horst.
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Tibia G-R|X and metal NLA 5.641.919, ringed as pullus F1 hybrid Larus cachinnans x argentatus hybrid on May 31 2025 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team (Mars Muusse / Thijs Horst / Fred Cottaar).
Mother: adult Herring Gull b/w-AB.
Father: adult Caspian Gull r-7P.
Nest: r-7P & b/w-AB.
In 2025 g-R|V & g-R|X fledged, g-R|W not seen since ringing. Fledging rate for this nest 2025 = 2,0.
Recoveries:
29-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
11-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
04-08-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
03-12-2025 Dordrecht (Vuiloverslag), Zuid-Holland, NL 5.148,00 N 442,00 E colourring read Leo Boon
Visits and data 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 |
| r-7P & b/w-AB | cach | teus | 70,5 | 50,6 | 69,9 | 49,2 | 69 | 48,8 | 3 | ||||
| dam: | dam 1 west
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| location: | was r7P-2024, far west
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| parents: | same as 2024
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| ringed: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | |
| 31-05-2025 | g-R|V | 5641917 | r-7P & b/w-AB | HYBRID | pullus | 562 | |||||||
| 31-05-2025 | g-R|W | 5641918 | r-7P & b/w-AB | HYBRID | pullus | 454 | |||||||
| 31-05-2025 | g-R|X | 5641919 | r-7P & b/w-AB | HYBRID | pullus | 488 | |||||||
OBSERVATIONS:
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| 16-03-2025 | nest | r-7P at location 2024, female is HG b/w-AB which was present, at bread
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| 21-03 | nest | both partners present near nest location
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| 25-03 | nest | r-7P present at nest location
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| 01-04 | nest | r-7P present at nest location
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| 04-04 | nest | r-7P and partner present
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| 21-04 | eggs | 3x eggs measured
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| food | leg of Greyleg goose chick
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| 13-05 | nest | 3 eggs hatching
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| 31-05 | chicks | 3x chicks ringed
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below: Caspian Gull cachinnans hybrid R|X 1CY, December 05 2025, Dordrecht, the Netherlands. Picture: Merijn Loeve.
below: Caspian Gull cachinnans hybrid R|X 1CY, August 04 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans hybrid R|X 1CY, June 29 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans hybrid R|X 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|X | .5641919 | r-7P & b/w-AB | HYBRID | pullus | 488 | Ringed pullus |
