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 argentatus hybrid 6.T 1CY, May - July 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[6.T] and metal NLA 5.625.171, ringed as pullus Larus argentatus hybrid at nest 54 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain in 2022: father is adult argentatus. Mother is zy[M.T], which is 10CY michahellis x argentatus hybrid.

date:              
29-4-2022 Nest checked. 3 eggs. Code 220 sprayed on boulder.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:  
  A 50 70,4 -- 35 - tip bottom    
  B 49,8 70 -- 5 mm - floating (wind egg)  
  C 47,9 66,6 -- 10 - tip bottom  
04-05-2022 3 eggs. zy-MT in a cluster of nests with Herring and Lesser Black-backed Gulls. Difficult to pin down birds to a nest.
22-05-2022 3 eggs.
30-05-2022 1 pullus near the nest. zy-MT present.
  metal darvic mass wing H+B Bill  
  .5625171 r-6T 173 40 - -  
  prey: Roach 1x.
02-06-2022 zy-MT and adult Herring Gull present.
17-06-2022 zy-MT and adult Herring Gull present.
21-06-2022 zy-MT and adult Herring Gull present.
12-07-2022 zy-MT and adult Herring Gull present. But within 10 meters range, also 2x Herring adults + 1 chick; 1x Lessie + 1 chick.
17-07-2022 2x adult Herring Gull present. As is r-6T.

below: Herring Gull argentatus hybrid 6.T 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argentatus hybrid 6.T 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[6.T] hybrid Herring Gull x Yellow-legged Gull hybrid, from nest 220 zy[M.T]. Picture: May 30th, 2022.
Ringed on May 30th. No ring readings since, but several chicks present at location by late June. No confirmation on other 2 eggs.