Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans F|N 1CY-2CY, May 2021 - December 2022, the Netherlands, Belgium & Spain. Picture: Albert de Jong, Roland-Jan Buijs, David Fernandez & Juan Ruiz.
Tibia blue B-F|N and metal Arnhem NLA 5.559.386 ringed as pullus Larus cachinnans on
May 28 2021 at nest 15 in colony Lelystad (Bataviahaven), Holland (5230.00 N 525.00 E), by ringer Roland-Jan Buijs.
ID certain, one parent is Caspian Gull cachinnans, the other Caspian Gull-type.
Recoveries after fledging:
21-08-2021 Blankenberge (Strand), West-Vlaanderen, BELGIE 5.119,00 N 307,00 E - Roland-Jan Buijs
04-12-2021 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W - J.M. Ruiz & D. Fernandez
11-12-2021 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W - D. Fernandez
08-01-2022 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W - J.M. Ruiz & D. Fernandez
27-02-2022 Colmenar Viejo (Vuilstort), Madrid, SPANJE 4.039,00 N 343,00 W colourring read Oscar Vilches
13-03-2022 Colmenar Viejo (Vuilstort), Madrid, SPANJE 4.039,00 N 343,00 W - David Fernández & Delfin Gonzalez
17-12-2022 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W colourring read David Fernández
24-12-2022 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W colourring read David Fernández
07-01-2023 Pinto (Vuilstort), Madrid, SPANJE 4.015,00 N 342,00 W colourring read David Fernández
Visits and data nest 15-2021:
| date: | ||||||
| 16-04-2021 | egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 16th: | red flag 15 placed near nest. |
| A egg | 52,6 | 70,6 | 98,35 | 50 - tip bottom | ||
| B egg | 51 | 72 | 94,29 | 40 - tip bottom | ||
| C egg | 50,5 | 74,5 | 95,66 | 35 - tip bottom | ||
| sum nest: | 288,30 | |||||
| 24-04-2021 | 2 eggs. | 1 adult at blocks, guarding from look-out. | ||||
| 26-04-2021 | Herring Gull tolerated on block in front of nest. Probably Herring Gull from nest 15B. | |||||
| Also, female on look-out and male leaves the nest for a short break or to check everything is okay. | ||||||
| 13-05-2021 | Female often on look-out block close to block 17, raising confusion if this is the partner of nest 17. | |||||
| 15-05-2021 | 1 egg cold, unfertile. Measurements Monika Ballmann: 73.2x50.4 (probably labeled C-egg in April) | |||||
| 2 chicks present in nest: Mass = 232 gr & Mass = 193 gr. | ||||||
| Food in nest: Roach (this is often a fishermen's by-catch from traps 200 meters from the nest). | ||||||
| 28-05-2021 | metal | tibia | mass | head + bill | 2 chicks ringed. | |
| pullus | .5559385 | b-F|M | 707 | 86,3 | ||
| pullus | .5559386 | b-F|N | 730 | 93,7 | ||
| 08-06-2021 | Both pulli swimming 100 meters from waterfront, right between dams with large bulkships approaching. Protected by 1 parent, made their way back to dam 2. | |||||
| 26-06-2021 | Nest abandoned. | |||||
below: Caspian Gull cachinnans F|N 2CY, December 17 2022, Colmenar Viejo dump, Madrid, Spain. Picture: David Fernandez.
below: Caspian Gull cachinnans F|N 2CY, March 13 2022, Colmenar Viejo dump, Madrid, Spain. Picture: David Fernandez.
below: Caspian Gull cachinnans F|N 2CY, January 08 2022, Pinto dump, Madrid, Spain. Picture: David Fernandez.
below: Caspian Gull cachinnans F|N 1CY, December 11 2021, Pinto dump, Madrid, Spain. Picture: Juan Ruiz.
below: Caspian Gull cachinnans F|N 1CY, August 20 2021, Blanckenberge beach, Belgium. Picture: Roland-Jan Buijs.
below: Caspian Gull cachinnans F|N 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong.
