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 hybrid 0.33 (was XPNU), 2CY-7CY, 2021-2026, the Netherlands. Picture: Theo Ruppert, Eric Roeland, Thijs Horst & Mars Muusse.
Tarsus y-XPNU, ringed as pullus on June 09 2020 at colony Gräbendorfer See, Germany. Then trapped as breeding 6CY Larus cachinnans hybrid on April 25 2025 at De Kreupel - nest M14, the Netherlands (5247.00 N 513.00 E).
Ringer Kees Camphuysen & Leon Kelder. Plastic y-XPNU and metal ring removed, and tarsus ring y-0.33 and logger #6518 attached.
See UvA-BITS for logger details.
Recoveries:
| Ring | Year | Mm | Dd | Location | Observer | NOTES | ||
| XPNU | 2020 | 6 | 9 | Gräbendorfer See, Brandenburg | FRG | Hiddensee | Ringing centre | Ringed as chick Larus cachinnans, recaptured in 2025 at De Kreupel (turns out to be hybrid) and re-ringed |
| XPNU | 2020 | 12 | 18 | Terschelling, omgeving van Oosterend | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 3 | 14 | Weerwater, Almere | NL | Hiddensee | Ringing centre | Photo provided https://gull-research.org/cachinnans/lelystad/xpnu.html Still as YPNU - EA224339 |
| XPNU | 2021 | 5 | 1 | Marais d'Harchies, Hainaut | B | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 7 | 7 | Kastel, Oost-Vlaanderen | B | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 7 | 11 | Neder-over-Heembeek, dump Veolia | B | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 8 | 2 | Dodewaard, Gelderland | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 8 | 22 | Oostvaardersdijk - uitkijkpunt Nonnetje | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2021 | 8 | 27 | De Vaart, vuilverwerking, Almere | NL | Eric | Roeland | Still as YPNU - EA224339 Photo provided https://gull-research.org/cachinnans/lelystad/xpnu.html |
| XPNU | 2023 | 2 | 12 | Duiven, Gelderland | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2023 | 3 | 31 | De Vaart, vuilverwerking, Almere | NL | Eric | Roeland | Still as YPNU - EA224339 Photo provided https://gull-research.org/cachinnans/lelystad/xpnu.html |
| XPNU | 2024 | 3 | 3 | De Kreupel | NL | Mars | Muusse | considered HYBRID. No mirror on P9. "Broad medial band on P10" |
| XPNU | 2024 | 3 | 16 | De Vaart, vuilverwerking, Almere | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2024 | 6 | 29 | De Kreupel | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2024 | 7 | 30 | De Kreupel | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2025 | 1 | 3 | De Vaart, vuilverwerking, Almere | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| XPNU | 2025 | 4 | 11 | De Kreupel | NL | Hiddensee | Ringing centre | Still as YPNU - EA224339 |
| 0,33 | 2025 | 4 | 25 | De Kreupel eiland Q | NL | C.J. | Camphuysen | Hiddensee FRG yellow XPNU, metal EA224339, re-ringed and GPS logger 6518 attached, 15:05-15:19, wing 68/20, pink feet wrong wing plus Caspian characters |
| 0,33 | 2025 | 7 | 8 | De Vaart, vuilverwerking, Almere | NL | Thijs | Horst | plumage fluffy, logger sits ok, dirty bird (the result of foraging in waste materials); wing pattern Herring Gull-like, pink feet |
| 0,33 | 2025 | 9 | 14 | Dashorstdijk, Almere | NL | Robert van der | Meer | Photo provided, vaguely grey spotted head (hence logged as transitional plumage) |
| 0,33 | 2025 | 9 | 14 | Dashorstdijk, Almere | NL | Eric | Roeland | https://waarneming.nl/observation/372724708/ |
| 0,33 | 2025 | 9 | 21 | Dashorstdijk, Almere | NL | Eric | Roeland | https://waarneming.nl/observation/373559472/ |
| 0,33 | 2025 | 11 | 5 | Scharwoude, visfuik palen | NL | Theo | Ruppert | Photo provided, logger well visible, sitting on wooden pole fish fyke at strekdam |
| 0,33 | 2025 | 12 | 3 | Scharwoude, visfuik palen | NL | Theo | Ruppert | Photo provided, position harness (too) well visible, wooden pole fish fyke Scharwoude |
| 0,33 | 2025 | 12 | 6 | Dashorstdijk, Almere | NL | Eric | Roeland | https://waarneming.nl/observation/381855417/ |
| 0,33 | 2025 | 12 | 6 | Dashorstdijk, Almere | NL | Folko van den | Brink | Photo provided, all body and harness again in good shape |
| 0,33 | 2026 | 1 | 26 | De Hulk, Hoorn | NL | Theo | Ruppert | Photo provided, feeding on dead Barnacle Goose |
below: Caspian Gull cachinnans hybrid 0.33 7CY, January 26 2026, Hoorn, the Netherlands. Picture: Theo Ruppert.
Not smart, as often Barnacle Goose is H5N1 victim these days.
below: Caspian Gull cachinnans hybrid 0.33 (was XPNU), 6CY, July 08 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
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below: Caspian Gull cachinnans hybrid 0.33 (was XPNU), April 25 - July 07 2025. Picture: GPS logger plot Uva-BITS.
below: Caspian Gull cachinnans hybrid XPNU 5CY, March 04 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
No mirror on P9. Broad medial band on P10.
below: Caspian Gull cachinnans hybrid XPNU 4CY, March 31 2023, Almere - De Vaart, the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans hybrid XPNU 2CY, August 27 2021, Almere - De Vaart, the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans hybrid XPNU 2CY, March 14 2021, Almere - De Vaart, the Netherlands. Picture: Eric Roeland.
HY=2020.
