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 5.E 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[5.E] and metal NLA 5.625.103, ringed as pullus Larus argentatus at nest 63 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID for nest 063 uncertain in 2022, one bird is probably sub-adult Herring Gull.

Visits and data 2022:
Estimation egg laying: A-egg = April 17 2022. Estimating hatching = May 14 2022.

date:              
15-04-2022 adult Herring Gull near empty nest.  
               
19-04-2022 adult Herring Gull near nest with 2 eggs.  
               
  egg no: width (mm): length (mm): volume (cm3):       
27-04-2022 A 51,4 71,7 -- 90 - tip bottom 2 eggs  
  B 51 70,6 -- 90 - tip bottom  
sum nest: --
   
01-05-2022 Herring Gull sub-adult (5CY) guarding at nest.
   
04-05-2022 still 2 eggs; 3rd egg not likely. 5CY Herring Gull = partner 1.
   
09-05-2022 2 eggs.
   
17-05-2022 2 chicks
  metal darvic mass H+B wing    
17-05-2022 .5625102 r-5.B 108 -- -- .
17-05-2022 .5625103 r-5.E 91 -- -- .
   
30-05-2022 2 chicks
  metal darvic mass H+B wing bill  
30-05-2022 .5625102 r-5.B 628 92,7 114 34,4
30-05-2022 .5625103 r-5.E 150 dead in nest
   
21-06-2022 .5625103 r-5.E dead in nest

r[5.E] argenteus (or hybrid) from nest 63. Picture: May 30th, 2022.
r[5.E] dead in nest on May 30th. Sibling r[5.B] ringed on May 17th and last observation May 30th.