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 2.2 1CY-4CY, 2022-2025, the Netherlands. Picture: Leon Kelder, Thijs Horst, Mars Muusse & Eric Roeland.
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Red tibia R-22 and metal Arnhem 5.623.555, ringed as pullus Larus cachinnans on 20-5-2022 at De Kreupel - island P, Holland (5247.00 N 513.00 E) - ringer Leon Kelder.
Unconfirmed that one parent is hyb rid caspian-type X712, later reringed y-0.15 and with GPS logger.
Recoveries:
02-08-2022 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
24-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
27-03-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
29-03-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
03-04-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
04-04-2023 Onderdijk (Vooroever), Noord-Holland, NL 5.244,00 N 508,00 E colourring read Leon Kelder
16-03-2024 Wervershoof (Vooroever), Noord-Holland, NL 5.245,00 N 507,00 E colourring read Jeroen van Assema
30-04-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
14-06-2024 Wervershoof (Vooroever), Noord-Holland, NL 5.245,00 N 507,00 E colourring read Leon Kelder
07-09-2024 Andijk (Jachthaven), Noord-Holland, NL 5.244,00 N 510,00 E colourring read J. van Assema & T. Horst
08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
Data for this nest
Bird from De Kreupel, nest P2 on island P.
| Date: | Egg code | Height (mm) | Width (mm) | Comments | Metal NLA | Colour ring | Wing (mm) | Head+ bill (mm) | Bill (mm) | Mass (gr) |
| 14-4-2022 | A-egg | 74.6 | 52.0 | 1 egg | ||||||
| 13-5-2022 | 1 wet chick, 1 hatching egg | |||||||||
| 20-5-2022 | 2 pulli in nest | 5623554 | Red 2.1 | 62.9 | 158 | |||||
| Caspian Gull y-X712 alarming | Red 2.2 | 70.4 | 251 |
below: Caspian Gull cachinnans 2.2 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
If y-0.15 was one parent in 2022 (then y-X712), this may help explain the lack of a P9 mirror and small P10 mirror in 4CY r-22.
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below: Caspian Gull cachinnans 2.2 3CY, September 07 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 2.2 2CY, February 24 2023, Almere, the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans 2.2 1CY, August 02 2022, De Kreupel - H, the Netherlands. Picture: Leon Kelder / camera trap.
