Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans F|V 1CY-2CY, May 2021 - April 2022, Lelystad, the Netherlands & the UK. Picture: Adam Rowlands, Stuart Ainsworth, Albert de Jong & Mars Muusse.
Blue tibia B-F|V and metal NLA Arnhem 5.559.407, ringed as pullus Larus cachinnans on May 28 2021 at nest 58 at Lelystad (Bataviahaven), Holland (NL 5230.00 N 525.00 E) - ringer Roland-Jan Buijs.
ID uncertain in 2021, one parent is 4CY-type and match pure Caspian Gull cachinnans. Other is 5CY uncertain cachinnans, with "hybrid type" P10 pattern and bill shape rather bulbous.
Recoveries:
28-08-2021 Walberswick (Strand), Suffolk, ENGELAND 5.218,00 N 140,00 E colourring read Adam Rowlands
25-04-2022 Skegness (Tennyson Sands), Lincolnshire, ENGELAND 5.306,00 N 19,00 E colourring read Stuart Ainsworth
16-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
22-10-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
Visits and data.
| date: | ||||||
| 24-04-2021 | One partner is sub-adult. Nest allows trapping breeders, easily. 3 eggs in nest. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 24th: | ||
| A egg | 46,2 | 75,3 | 80,92 | 60 - tip bottom | ||
| B egg | 48,3 | 73,7 | 86,57 | 35 - tip bottom | ||
| C egg | 48,9 | 72,9 | 87,77 | 25 - tip bottom | ||
| sum nest: | 255,26 | |||||
| 26-04-2021 | Breeding bird is moulting sub-adult (4CY). Also 5CY present on bread, but really bird of nest 58? | |||||
| 13-05-2021 | Partner 2 is 5CY bird! 4CY also patrolling over nest. 5CY bird chasing neighbour Lesser Black-backeds. | |||||
| 3 eggs just hatching. | ||||||
| 15-05-2021 | C egg with small cracks, will hatch soon. | |||||
| 1 hatched chick, still wet, hatched this morning. | ||||||
| 1 hatched chick (1 day old). Mass = 66 gr. | ||||||
| 28-05-2021 | metal | tibia | mass | head + bill | ||
| pull | .5559407 | b-F|V | >400 | 82,8 | ||
| pull | .5559408 | b-F|W | >400 | 84,4 | ||
| 08-06-2021 | 2 partners at nest. Chasing neighbouring Lesser Black-backeds. | |||||
| 26-06-2021 | No activity. | |||||
below: Caspian Gull cachinnans F|V 5CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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below: Caspian Gull cachinnans F|V 2CY, April 25 2022, Skegness, Lincolnshire, UK. Picture: Stuart Ainsworth.
below: Caspian Gull cachinnans F|V 1CY, August 28 2021, Walberswick beach, Suffolk, UK. Picture: Adam Rowlands.
below: Caspian Gull cachinnans F|V 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong & Mars Muusse.
The Daltons.
