Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Cachinnans - nest De Kreupel 02P4 / r-KG
General remarks:
- Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
- Nest on island "B", positioned at edge. Nest coded "B02" in season 2021.
- Both parents are cachinnans. Female already ringed: red 02P4 from Poland. This Polish bird trapped and ringed r-KG in 2021.
| location: | April 9th, 2021. | April 9th, 2021: male at nest. | April 9th, 2021: partners at look-out. |
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| eggs: | April 9th, 2021. | April 9th, 2021. | . |
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| partner 1: | April 10th, 2020: female r[02P4]. | June 21st, 2020: female r[02P4]. | . |
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| April 9th, 2021: female r[02P4]. | May 14th, 2021: female r-K.G. | April 23rd, 2021: female r-K.G (more images). | |
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| partner 2: | April 10th, 2020: both partners. | June 21st, 2020: male. | |
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| May 14th, 2021: male. | June 17th, 2021: male. | ||
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| pulli | May 21st, 2020: pullus p[F1]. | May 21st, 2020: pullus p[F1]. | June 26th, 2020 pullus p[F1]. |
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| May 21st, 2020: pullus p[F=]. | May 21st, 2020: pullus p[F=]. | . | |
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| June 17th, 2021: juvenile b[D|G]. | June 17th, 2021: juvenile b[D|G]. | . | |
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| prey: | May 14th, 2021: 5x Cormorant eggs | May 14th, 2021: 1x leg of pullus Grey-lagged Goose. | |
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Visits and data.
| date: | egg no: | width (mm): | length (mm): | volume (cm3): | comments: | ||
| 10-4-2020 | -- | Two adults, including female from Poland. | |||||
| 8-5-2020 | C | 50,2 | 72,4 | 132,49 | 2 pulli & 1 egg; pulli ringed. | ||
| WING: | HEAD + BILL: | BILL: | WEIGHT: | ||||
| 8-5-2020 | pullus | NLA 5.545.417 & p[F1] | -- | 51.1 | 19.9 | 75 | |
| 8-5-2020 | pullus | NLA 5.545.418 | -- | 50.6 | 19.8 | 69 | Too small for colour ring. |
| 21-5-2020 | pullus | NLA 5.545.417 & p[F1] | 100.0 | 90.7 | 38.1 | 558 | |
| 21-5-2020 | pullus | NLA 5.545.418 & p[F=] | 98.0 | 89.4 | 37.1 | 517 | Colour ring added. |
| 21-5-2020 | pullus | NLA 5.545.432 | 83.5 | 85.7 | 36.0 | 440 | New, probably C-chick. |
| 12-6-2020 | juvenile | NLA 5.545.418 & p[F=] | B-chick p[F=] is dead. | ||||
| 26-6-2020 | juveniles | Two adults with two fledged juveniles. | |||||
| date: | egg no: | width (mm): | length (mm): | volume (cm3): | comments: | ||
| 9-4-2021 | A egg | 51.2 | 74.1 | r[02P4] & unringed adult male at nest. | |||
| B egg | 49.0 | 67.2 | 3 eggs. | ||||
| C egg | 51.1 | 78.7 | https://waarneming.nl/observation/210425398/ | ||||
| 23-4-2021 | eggs | 3 eggs in nest. | |||||
| Attempt to trap adult at nest. Successful: r[02P4] trapped and new ring attached. | |||||||
| metal: | tibia: | wing (mm) | head + bill | tarsus | bill | ||
| adult | Gdansk DN31202 | Red-K.G | 445.0 | 126.0 | 65.3 | 59.1 | |
| mass (gr) | Moult score | bill height | grey scale | Swob | |||
| 858 | 10x0 | 17.1 | 5.5 | 1083 | |||
| WING: | HEAD + BILL: | TARSUS: | MASS (gr): | ||||
| 14-5-2021 | pullus | NLA 5.556.747 & b[D|E] | 86.0 | 83.1 | 54.1 | 433 | 2 chicks outside nest, ringed. |
| pullus | NLA 5.556.748 & b[D|G] | 73.0 | 82.5 | 54.8 | 439 | No eggs. What happened to 3rd chick? | |
| prey | 5x Cormorant eggs; 1x Coot egg; 1x leg of pullus Grey-lagged Goose. https://waarneming.nl/observation/214661741/ | ||||||
| 20-5-2021 | pullus | Shit traces all over the place, but chicks not found. | |||||
| Alarming adults over nest location. | |||||||
| 17-6-2021 | juvenile | 2 juveniles near nest, one is b-D|G. https://waarneming.nl/observation/217412355/ | |||||
| adult | Unringed male & female r-K.G present. | ||||||