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 F.B adult, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Roland-Jan Buijs & Mars Muusse.
Ringed as adult female Caspian Gull Larus cachinnans on May 28 2021 at nest 61 in colony Lelystad, the Netherlands. Bird with broad black medila band on P10 (too broad for pure cachinnans?).
Visits and data:
| date: | ||||||||
| 24-04-2021 | 2 partners present, both cachinnans. Nest allows trapping breeders, easily. | |||||||
| 2 eggs in nest. | ||||||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 24th: | ||||
| A egg | 50,8 | 71,8 | 93,29 | 30 - tip bottom | ||||
| B egg | 49,7 | 70,4 | 87,56 | 25 - tip bottom | ||||
| sum nest: | -- | |||||||
| 26-04-2021 | Both partners present, one guarding, one breeding. A female cachinnans with hanging left leg in flight is most probably NOT the breeding female. Is another cachinnans breeding here as well? | |||||||
| 13-05-2021 | Both partners present. Male has 5CY markings. Now the right female photographed in flight. | |||||||
| 3 eggs in nest. | ||||||||
| 15-05-2021 | 3 eggs in nest. | |||||||
| 28-05-2021 | 3 eggs in nest. | |||||||
| Cage placed and one bird (female) trapped for ringing. | ||||||||
| metal | tibia | mass | head + bill | wing | tarsus | bill | ||
| adult | .5559427 | r-F.B | 1030 | 124 | 454 | 69,7 | 59,8 | |
| 08-06-2021 | Both partners present. At least 2 chicks around. | |||||||
| metal | tibia | mass | head + bill | wing | ||||
| 26-06-2021 | pullus | .5550695 | r-F.Y | 649 | 90,4 | 157 | most likely cachinnans chick of nest 61. | |
| pullus | .5550696 | r-F.Z | 1126 | 111,8 | 260 | argentatus, near nest 61, from neighbouring nest. | ||
| pullus | .5550697 | r-F.1 | 1036 | 108,6 | 269 | argentatus, near nest 61, from neighbouring nest. | ||
| pullus | .5550698 | r-F.2 | 879 | 98,4 | 230 | argentatus, near nest 61, from neighbouring nest. | ||
