Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans R|S 1CY, 2025, the Netherlands & England. Picture: Thijs Horst & Romano da Costa.
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Tibia G-R|S and metal NLA 5.641.913, 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 g-N|C.
Father: adult Caspian Gull g-N|E.
Nest: g-N|C & g-N|E (163). In 2025, g-T|P & g-R|S fledged, g-T|N not seen after ringing. 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
25-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
30-06-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
10-08-2025 St.Ouen's Bay (Strand), Jersey, ENGELAND 4.920,00 N 222,00 W colourring read Romano da Costa
17-09-2025 Vila Nova de Gaia (Estuario do Douro) Douro Litoral PORTUGAL 4.108,00 N 839,00 W colourring read Francisco Pires & Helder Vieira
Visits and data 2025 for nest g-N|C & g-N|E (163).
| 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|C & g-N|E | cach | cach | 70,6 | 47,8 | 70 | 49,6 | 69,8 | 49 | 3 | |||||
| (163) | ||||||||||||||
| dam: | dam 1 blocks | |||||||||||||
| location: | nest 163 "Vliertje", at blocks west part, close to waterfront, next to Elderberry. | |||||||||||||
| parents: | same as 2024, this year both parents ringed, now g-N|C and g-N|E.
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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|C | 5641012 | 163, vliertje | PONT | F | >4CY | 439 | 859 | 124,6 | 55,1 | 67,8 | 18 | 5,5 | |
| 28-04-2025 | g-N|E | 6254554 | 163, vliertje | PONT | M | >4CY | 465 | 1128 | 128,7 | 61,4 | 70,3 | 20,1 | 5 | |
| 13-05 | g-T|N | 5641083 | 163 | PONT | pullus | 537 | ||||||||
| 13-05 | g-T|P | 5641084 | 163 | PONT | pullus | 453 | ||||||||
| 31-05 | g-T|P | g-N|C & g-N|E | PONT | 819 | ||||||||||
| 31-05 | g-R|S | 5641913 | g-N|C & g-N|E | PONT | pullus | 787 | Herring Gull?
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| 09-06-2025 | g-R|S | 5641913 | g-N|C & g-N|E | PONT | pullus | 758 | CONTROL | |||||||
OBSERVATIONS:
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| 23-04-2025 | eggs | 3 eggs, measured.
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| adult | female cachinnans.
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| 28-04-2025 | eggs | 2x eggs hatching.
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| adult | 2x cachinnans trapped on nest now g-N|C and g-N|E.
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| 01-05 | adult | g-N|E present.
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| 13-05 | chicks | 2x chicks ringed, 3rd not found.
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| 31-05 | chicks | retrapped g-T|P.
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| 09-06-2025 | chicks | g-R|S found and measured, g-T|P near nest 139 on blocks.
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| Conlusion: g-T|P & g-R|S fledged, g-T|N not seen after ringing.
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below: Caspian Gull cachinnans R|S 1CY, August 10 2025, St.Ouen's Bay - Jersey, England. Picture: Romano da Costa.
below: Caspian Gull cachinnans R|S 1CY, June 30 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans R|S 1CY, June 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans R|S 1CY, June 09 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans R|S 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 |
| 31-05-2025 | G-R|S | .5641913 | g-N|C & g-N|E | PONT | pullus | 787 | Ringed pullus | ||||||
| 09-06-2025 | G-R|S | .5641913 | PONT | pullus | 758 |
