Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans R|H 1CY, 2025, the Netherlands & England. Picture: Andrew Allport, Thijs Horst & Mars Muusse.
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Tibia G-R|H and metal NLA 5.641.899, ringed as pullus Larus cachinnans on May 31 2025 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team (Mars Muusse / Thijs Horst / Fred Cottaar).
Mother: adult Caspian Gull.
Father: adult Caspian Gull g-M|=.
Nest: g-M|= (17B). In 2025, G-R|H & G-R|J fledged. Fledging rate for this nest 2025 = 2,0.
Recoveries:
13-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
29-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
30-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
02-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
09-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
28-07-2025 Flamborough Head (Bridlington Bay), Yorkshire, ENGELAND 5.406,00 N 2,00 W colourring read Andrew Allport
Visits and data 2025 g-M|= (17B).
| 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-M|= (17B) | cach | cach | 68 | 50 | 65 | 50 | 63 | 50,6 | 3 | |||||
| dam: | dam 2 central
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| location: | 17B, same nest as in 2021-2024
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| parents: | this season managed to trap male, now g-M|=. | |||||||||||||
| ringed: | ||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |
| 28-04-2025 | g-M|= | 6254498 | 17B | PONT | M | >4CY | 454 | 1107 | 140 | 62 | 74,1 | 21 | 6 | |
| 31-05-2025 | G-R|H | 5641899 | on water | PONT | pullus | 704 | 116 | |||||||
| 31-05-2025 | G-R|J | 5641900 | on water | PONT | pullus | 837 | 113,9 | |||||||
OBSERVATIONS:
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| 16-03-2025 | nest | 2x cach at nest location 2021-2024. | ||||||||||||
| 20-03 | nest | 2x cach present.
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| 01-04 | nest | 2x cach present.
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| 21-04 | eggs | 3x eggs measured.
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| adult | attempt to trap breeding adult, failed.
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| 28-04 | nest | 2x eggs hatching.
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| adult | male cachinnans trapped on nest, now g-M|=.
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| 08-05 | adult | both partners present.
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| 31-05 | chicks | g-R|H & g-R|J trapped on water around X60J in a group of juveniles; X60J and g-A|B alarming above (but X60J alarming a lot). | ||||||||||||
| 09-07-2025 | chick | g-R|H caught on water, but was resting at nest 17B with ringed brother (likely g-R|J but uncertain) and unringed mother.
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below: Caspian Gull cachinnans R|H 1CY, July 28 2025, Flamborough Head - Yorkshire, England. Picture: Andrew Allport.
below: Caspian Gull cachinnans R|H 1CY, July 09 2025, colony Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.
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below: Caspian Gull cachinnans R|H 1CY, June 30 2025, colony Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.
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below: Caspian Gull cachinnans R|H 1CY, June 29 2025, colony Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.
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below: Caspian Gull cachinnans R|H 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|H | .5641899 | on water around X60J. X60J and g-A|B alarming above | PONT | pullus | 704 | 116 | Ringed pullus |
