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 hybrid 6.8 1CY-3CY, May 2022 - January 2025, Lelystad & Almere, the Netherlands. Picture: Thijs Horst, Mars Muusse & Eric Roeland.
Red tibia ring r[6.8] and metal NLA 5.625.150, ringed as pullus Larus cachinnans hybrid at nest 244 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal - Roland-Jan Buijs ringing team.
ID certain in 2022: one parent is adult Herring Gull argenteus and other parent is sub-adult Caspian Gull cachinnans.
Recoveries:
30-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
02-07-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-08-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
23-09-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
23-09-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
24-09-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
10-04-2023 Westerslag (Strand), Texel, NL 5.302,00 N 442,00 E colourring read Job ten Horn
Bird from nest 244, data for this nest:
| 4-May-22 | 3 eggs | A egg | 65,4 | 51 | floating - 4 mm | ||
| B egg | 67,8 | 49 | floating - 4 mm | ||||
| C egg | 63,4 | 47,6 | floating - 4 mm | ||||
| sub-adult cachinnans at this nest. | |||||||
| metal | darvic | mass | wing | H+B | age | ||
| 22-May-22 | pullus | .5625150 | - | 73 | 27 | 50,8 | 2 days, too small for darvic ring. |
| pullus | .5625151 | - | 68 | 24 | 50,2 | 2 days, idem. | |
| pullus | .5625152 | - | 60 | 22 | 47 | 1st day, idem. | |
| metal | darvic | mass | wing | H+B | bill | ||
| 30-May-22 | pullus | .5625150 | r-68 | 267 | 45 | 67,6 | 26 |
| pullus | .5625151 | r-67 | 258 | 46 | 68,1 | 24 | |
| pullus | .5625152 | r-65 | 244 | 38 | 63,6 | 23 | |
| 02-Jun-22 | probably Herring Gull at this nest? But be aware of other nest close by. | ||||||
| 17-Jun-22 | adult Herring Gull neat nest. | ||||||
| 21-Jun-22 | pullus | darvic | mass | H+B | Bill | Tarsus | Wing |
| r-68 | 888 | 111 | 42,2 | 77,5 | 255 | ||
below: Caspian Gull cachinnans hybrid 6.8 3CY, January 30 2025, Almere - de Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans hybrid 6.8 1CY, September 24 2022, Almere (De Vaart), the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans hybrid 6.8 1CY, August 19 2022, Almere, the Netherlands. Picture: Eric Roeland.
below: Caspian Gull cachinnans hybrid 6.8 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
r[6.8] cachinnans x argentatus hybrid from nest 244. Picture: May 30th, 2022.
r[6.8] fledged. Sibling r[6.5] & r[6.7] ringed on May 30th. No observations since for these two birds.
below: Caspian Gull cachinnans hybrid 6.8 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
