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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Herring Gull argenteus 7.A 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[7.A] and metal NLA 5.625.182, ringed as pullus Larus argentatus at nest w[8.Z] on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain in 2022: both parents are adult Herring Gull argenteus, one of the parents is ringed w[8.Z].

Visits and data:
Estimation egg laying: A-egg = April 26 2022. Estimating hatching = May 24 2022.

date            
27-04-2022 1 egg egg no: width (mm) length (mm) volume (cm3):  water test on April 27th: 
    A egg 47,7 66,5 -- 0 - flat bottom
01-05-2022 2 adult Herrings at nest, one is ringed w-8Z.
04-05-2022 code '122' sprayed on tarmac. 2x Herring Gulls (incl w-8Z) at nest.
  3 eggs egg no: width (mm) length (mm) volume (cm3):  water test: 
    A egg 48,6 66,5 -- --
    B egg 45,6 68,2 -- --
    C egg 47,9 68,3 -- --
17-05-2022 3 eggs.
22-05-2022 3 eggs.
30-05-2022 No chicks found.
  metal: darvic: wing: Head + Bill: Bill: Mass:  
  NLA .5625182 r-7.A 30 56,3 18,5 145  
12-07-2022 w-8Z photographed.

below: Herring Gull argenteus 7.A 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[7.A] argenteus from nest 122 w[8.Z]. Picture: May 30th, 2022.
Ringed May 30th. No observations since. No confirmation on 2 other eggs.