Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans hybrid R|U 1CY, 2025, the Netherlands. Picture: Han Buckx & Thijs Horst.
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Tibia G-R|U and metal NLA 5.641.916, ringed as pullus 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.
Father: adult Caspian Gull g-A|N.
Nest: g-A|N (099). In 2025, g-R|U fledged, 1 chick dead in nest 1 rotten egg. Fledging rate for this nest 2025 = 1,0.
Recoveries:
08-10-2025 Velsen (Strand Noordpier), Noord-Holland, NL 5.228,00 N 433,00 E colourring read Thijs Horst
09-10-2025 Velsen (Strand Noordpier), Noord-Holland, NL 5.228,00 N 433,00 E colourring read Jan Zorgdrager & Martijn van Manen
12-10-2025 Velsen (Strand Noordpier), Noord-Holland, NL 5.228,00 N 433,00 E colourring read Jan Zorgdrager
07-11-2025 Bloemendaal aan Zee (Strand), Noord-Holland, NL 5.224,00 N 432,00 E colourring read Han Buckx
Visits and data 2025 for nest g-A|N (099).
| 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|N (099) | cach | teus | 73,2 | 48,1 | 67 | 46,9 | 72 | 48,9 | 3 | |||||
| dam: | dam 1 south
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| location: | near Blackberry top of dam, 50 mtr E of r-7P, Code sprayed on tarmac
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| parents: | same as 2024, hybrid couple of Caspian Gull g-A|N & Herring Gull
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| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |
| 31-05-2025 | g-R|U | 5641916 | g-A|N | HYBRID | pullus | 120 | ||||||||
| 09-06-2025 | g-R|U | 5641916
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g-A|N | HYBRID | pullus | 398 | CONTROL | |||||||
OBSERVATIONS:
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| 16-03-2025 | nest | g-A|N & female HG, like in 2024, nest 99
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| 21-03-2025 | nest | G-A|N & female HG, like in 2024, nest 99
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| 25-03 | nest | G-A|N & female HG, like in 2024, nest 99
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| 21-04 | nest | ready, but still empty
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| 13-05 | nest | 3x eggs measured, g-A|N trapped at nest while we aimed for the Herring Gull partner.
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| 31-05 | chicks | 1 chick ringed, 1 dead in nest and 1 failed egg
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| 09-06-2025 | chicks | g-R|U found and measured
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below: Caspian Gull cachinnans hybrid R|U 1CY, November 07 2025, Bloemendaal, the Netherlands. Picture: Han Buckx.
Note strong Herring Gull vibe.
below: Caspian Gull cachinnans hybrid R|U 1CY, October 08 2025, IJmuiden, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans hybrid R|U 1CY, June 29 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
| date | darvic | metal | nest | species | sexe | age | wing | mass | head+ bill | bill | gonys | barcode | comments |
| 31-05-2025 | G-R|U | .5641916 | g-A|N | HYBRID | pullus | 120 | Ringed pullus | ||||||
| 09-06-2025 | G-R|U | .5641916 | g-A|N | HYBRID | pullus | 398 | |||||||
| 29-06-2025 | G-R|U | .5641916 | NEST 99, g-A|N | HYBRID | pullus | 279 | 762 |
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below: Caspian Gull cachinnans hybrid R|U 1CY, June 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans hybrid R|U 1CY, May 31 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
