Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Caspian Gull cachinnans 6.2 1CY & 4CY, 2022-2025, the Netherlands. Picture: Tom Whiley, Thijs Horst & Mars Muusse.
Red tibia ring r[6.2] and metal NLA 5.625.178, ringed as pullus Larus cachinnans at nest 135 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Albert de Jong / Roland-Jan Buijs ringing team.
ID certain in 2022: both parents are adult cachinnans, one is a diagnostic bird called "thayeri".
Recoveries:
02-08-2022 Cley (Marshes), Norfolk, ENGELAND 5.257,00 N 103,00 E colourring read Tom Whiley
18-01-2023 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Benjamin Griard
20-01-2023 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Benjamin Griard
200-4-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
17-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
Visits and data for 2022
| 15-04-2022 | Nest ready. Still empty. With adult Caspian Gull. | ||||||
| 19-04-2022 | Adult female thayeri now here. | ||||||
| egg no: | width (mm): | length (mm): | volume (cm3): | water test | |||
| 27-04-2022 | A egg | 50,9 | 73,4 | -- | 90 - tip on bottom | ||
| B egg | 50 | 75,9 | float - 1 mm | ||||
| C egg | 51,9 | 74,5 | -- | 90 - tip on bottom | |||
| sum nest: | -- | ||||||
| 04-05-2022 | Adult breeding at nest. | ||||||
| 30-05-2022 | 2 chicks at nest. | ||||||
| metal | darvic | mass | wing | H+B | Bill | ||
| pullus | .5625178 | r-6.2 | 472 | 115 | 85,8 | 33,6 | |
| pullus | .5625179 | r-6.3 | 411 | 70 | 83,6 | 29,5 | |
| 02-06-2022 | 2 adults at nest and 2 chicks, no rings visible. | ||||||
| 21-06-2022 | Adult thayeri at nest. Easy on bread. | ||||||
| 28-06-2022 | Adult thayeri at nest. Easy on bread. | ||||||
| 12-07-2022 | Adult thayeri at nest. Moult: P2/P5. With r-62. | ||||||
| 17-07-2022 | Adult thayeri at nest. | ||||||
below: Caspian Gull cachinnans 6.2 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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below: Caspian Gull cachinnans 6.2 1CY, August 02 2022, Cley, UK. Picture: Tom Whiley.
below: Caspian Gull cachinnans 6.2 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 6.2 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
r[6.2] cachinnans from nest 135. Picture: May 30th, 2022.
Ringed on May 30th. Same for sibling r[6.3]. Two chicks present at nest on June 2nd, which are likely these two chicks, but no view on legs. No confirmation on 3rd egg.
