Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Herring Gull argenteus (hybrid?) S|0 1CY-4CY, June 2021 - April 2024, the Netherlands. Picture: Jeroen Nagtegaal, Thijs Horst & Mars Muusse.
In nest 17, mother is Herring Gull. Father maybe Caspian Gull.
Tibia ring B-S|0 and metal NLA Arnhem 5.559.383, ringed as pullus Larus argentatus on May 28 2021 at Lelystad (Bataviahaven), Holland (5230.00 N 525.00 E - ringer Roland-Jan Buijs.
Recoveries:
08-07-2022 Alkmaar (Vuiloverslag), Noord-Holland, NL 5.236,00 N 445,00 E colourring read B. Buinsters & R.J. Buijs
14-11-2022 Utrecht (Vuiloverslag), Utrecht, NL 5.207,00 N 503,00 E colourring read Albert de Jong & Roland-Jan Buijs
28-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
04-05-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
23-09-2023 Utrecht (Haarrijnseplas), Utrecht, NL 5.207,00 N 501,00 E colourring read Yorick Smakman
12-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read M. Loeve & M. Muusse
below: Herring Gull argenteus (hybrid?) S|0 4CY, April 21 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Herring Gull argenteus (hybrid?) S|0 4CY, April 12 2024, colony Lelystad, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
below: Herring Gull argenteus (hybrid?) S|0 3CY, May 04 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Herring Gull argenteus (hybrid?) S|0 1CY, June 26 2021, Lelystad, the Netherlands. Picture: Jeroen Nagtegaal & Mars Muusse.
b-S|0 has dark outerwebs on inner primaries. Brother/sister b-S|Z is more like Herring Gull.
Visits and data nest 17.
| date: | ||||||
| 16-04-2021 | 2 eggs. | Behind block code "17". Red flag placed near nest. | ||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 16th: | ||
| A | 53,5 | 71,5 | 103,04 | 20 - flat on bottom | ||
| B | 52,3 | 68,9 | 94,89 | 25 - flat on bottom | ||
| 24-04-2021 | Nest 17 at flag disappeared? Herring Gull sub-adult started new nest 17 1 meter to the west, it has again 2 eggs. | |||||
| 2 eggs. | Behind bundle of braches and twigs. Flag replaced to this nest. And bundle sprayed red with paint. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 24th: | ||
| A | 50,9 | 69,3 | 90,4 | 20 - flat on bottom | ||
| B | 50,9 | 70,6 | 92,1 |
20 - flat on bottom | ||
| 26-04-2021 | Herring Gull at new nest 17, at look-out stone 40 cm from nest. Two yellow-legged birds again 6 mtr to the right forming a new pair, will be nest 41. | |||||
| On blocks, 10 meter below nest 17 at waterfront, always a guarding Caspian Gull type (not pure). This will later be nest 45. | ||||||
| 13-05-2021 | On blocks, 10 meter below nest 17 at waterfront, again alert Caspian Gull type. | |||||
| 15-05-2021 | Nest 17 and nerst 41 split now definitely. Nest 17 with Herring gull sub-adult and 3 eggs. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 15th: No | Measurements Monika Ballmann. | |
| A | 50,5 | 69,2 | 88,86 | -- | ||
| B | 50,6 | 70 | 90,24 |
-- | ||
| C | 49,5 | 68,9 | 85 | -- | ||
| 28-05-2021 | metal ring: | tibia ring: | mass (gr): | head + bill: | ||
| pullus | .5559382 | b-S|Z | 123 | 56,5 | ||
| pullus | .5559383 | b-S|0 | 243 | 64,5 | ||
| pullus | .5559384 | b-S|1 | 198 | 63,6 | ||
| 08-06-2021 | Herring Gull sub-adult at nest. | |||||
| On blocks, below nest 17 at waterfront, now 2 Caspian Gull type birds. The guarding Caspian Gull type will now be assigned nest 45, no longer potentially linked to nest 17. | ||||||
| 26-06-2021 | metal ring: | tibia ring: | mass | head + bill | wing | |
| pullus | .5559382 | b-S|Z | 1039 | 113,3 | 287 | |
| pullus | .5559383 | b-S|0 | 947 | 111,3 | 305 | |