Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Herring Gull argenteus (hybrid?) S|0 1CY-4CY, June 2021 - July 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
21-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
23-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
31-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Merijn Loeve
01-06-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
24-06-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
09-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
15-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst

below: Herring Gull argenteus (hybrid?) S|0 4CY, July 15 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Herring Gull argenteus (hybrid?) S|0 4CY, July 09 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

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