Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Caspian Gull cachinnans C.U 1CY-4CY, 2022-2025, the Netherlands. Picture: Thijs Horst, Mars Muusse, Menno Kuiper & Eric Roeland.
Red tibia ring r[C.U] and metal NLA 5.625.069, ringed as pullus Larus cachinnans at nest 14 on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain in 2022, both parents are the same as previous year, Caspian Gull cachinnans.
Recoveries:
17-05-2021 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
23-07-2022 Almere (Oostvaardersplassen), Flevoland, NL 5.226,00 N 517,00 E colourring read Camilla Dreef
07-10-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
16-11-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
30-11-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
20-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
26-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
04-04-2024 Polder Zeevang (Klemweg), Noord-Holland, NL 5.233,00 N 501,00 E colourring read Maarten Hotting
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
01-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
12-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
23-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Horst, Muusse(s) & Cottaar
08-05-2025 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
09-07-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
05-10-2025 Reeuwijk (Reeuwijkse plassen), Zuid-Holland, NL 5.203,00 N 445,00 E colourring read Menno Kuiper
Visits and data for this nest in 2022
Estimation egg laying: A-egg = April 09 2022. Estimating hatching = May 07 2022.
| date: | ||||||
| 11-04-2022 | adult near nest. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: | ||
| 15-04-2022 | A egg | 51,7 | 70 | -- | 10 - tip on bottom | 3 eggs. |
| B egg | 51,7 | 76,7 | -- | 30 - tip on bottom | ||
| C egg | 51,7 | 72,1 | -- | 20 - tip on bottom | ||
| 19-04-2022 | guarding adfult on block. | |||||
| 29-04-2022 | A egg | float - 1 mm | ||||
| B egg | float - 2 mm | |||||
| C egg | float - 1 mm | |||||
| metal | tibia | mass | head + bill | wing | ||
| 09-05-2022 | 5625068 | r-C.T | cachinnans | |||
| 5625069 | r-C.U | cachinnans | ||||
| 1 egg, hatching soon (A-egg). | ||||||
| metal | tibia | mass | head + bill | wing | ||
| 17-05-2022 | 5625069 | r-C.U | 363 | -- | cachinnans | |
| 5625136 | r-5.2 | 206 | 69,7 | cachinnans | ||
| 30-05-2022 | from the boat one ringed chick visible, not found back later between blocks. | |||||
| 17-06-2022 | two ringed chicks present, possibly 3rd as well, but not seen. | |||||
| 21-06-2022 | r-52 swimming, together with r-54 (from nest y-X56A). R-CU & r-CT not seen. | |||||
| 21-06-2022 | Later this day: now r-52 swimming in creche with another 3 juveniles, including r-CU. Not all legs visible, to check for rings. | |||||
| 17-07-2022 | r-52 photographed. | |||||
below: Caspian Gull cachinnans C.U 4CY, October 05 2025, Reeuwijkse plassen, the Netherlands. Picture: Menno Kuiper.
below: Caspian Gull cachinnans C.U 4CY, April 12 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans C.U 4CY, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
With much black in plumage.
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below: Caspian Gull cachinnans C.U 3CY, March 26 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans C.U 3CY, March 20 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans C.U 1CY, October 07 2022, Almere, the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans C.U 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
r[C.U] cachinnans from nest 14. Picture: June 21st, 2022.
Fledged. Sibling r[5.2] also fledged. Sibling r[C.T] ringed on May 9th and not recorded since, although possibly present at nest on June 17th.
below: Caspian Gull cachinnans C.U 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
below: Caspian Gull cachinnans C.U 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
