Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Caspian Gull cachinnans F.E 1CY-2CY, May 2021 - August 2022, the Netherlands & UK. Picture: Merijn Loeve, Tom Whiley, Jonny Rankin & Mike Ball.

R-FE and metal Arnhem 5.559.429, ringed as pullus Larus cachinnans on 28-05-2021 at nest 03 in colony Lelystad, the Netherlands (NL 5230.00 N 525.00 E) - ringer Roland-Jan Buijs.

Recoveries:
24-08-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andrew Hale
29-08-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Max Hellicar
02-09-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Andrew Hale
04-09-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Jeff Higgott
09-09-2021, Cromer (Strand), Norfolk, ENGELAND 5.255,00 N 118,00 E colourring read Mike Ball
26-09-2021, Cley (Marshes), Norfolk, ENGELAND 5.257,00 N 103,00 E colourring read Tom Whiley
04-08-2022 Great Livermere, (Livermere Lakes), Suffolk, ENGELAND 5.218,00 N 45,00 E colourring read Jonny Rankin
10-01-2023 Dune du Pilat (Strand), Landes, FRANKRIJK 4.435,00 N 112,00 W found dead Adrien de Montaudouin

Certainty on ID in 2020 & 2021, parents at this nest are same two Caspian Gulls cachinnans as in season 2020.
Visits and data:

date:    
16-04-2021 One adult is 100% certain partner 2 2020. Alert adult near nest.
  Nest with 3 eggs.
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:  
  A egg 50,5 75,1 96,43 35 - tip at bottom  
  B egg 50,4 72,1 92,21 40 - tip at bottom  
  C egg 49,5 72,3 89,20 30 - tip at bottom  
      sum nest: 277,84  
24-04-2021 3 eggs present.
26-04-2021 Adult very reluctant to leave the nest.
06-05-2021 No visit.
13-05-2021 No visit, due to Spoonbills settling.
15-05-2021 No visit, due to thunder.  
28-05-2021   metal tibia mass (gr) head + bill (mm)  
  pullus .5559428 r-F.D 707 93,3  
  pullus .5559429 r-F.E 641 93  
08-06-2021 One guarding adult, near location where we ringed chicks.
26-06-2021 No visit, due to narrow timeframe.
09-07-2021 Female at blocks, right beneath nest 3, with fledged unringed juvenile.

below: Caspian Gull cachinnans F.E 2CY, August 04 2022, Livermere, U.K. Picture: Jonny Rankin.

below: Caspian Gull cachinnans F.E 1CY, September 26 2021, Cromer, Norfolk, UK (5.255,00 N 118,00 E). Picture: Tom Whiley.

below: Caspian Gull cachinnans F.E 1CY, September 09 2021, Cromer, Norfolk, UK (5.255,00 N 118,00 E). Picture: Mike Ball.

below: Caspian Gull cachinnans F.E 1CY, September 02 2021, Cromer, Norfolk, UK. Picture: Andrew Hale.

below: Caspian Gull cachinnans F.E 1CY, August 24 2021, Cromer, Norfolk, UK. Picture: Andrew Hale.

below: Caspian Gull cachinnans F.E 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Merijn Loeve & Mars Muusse.