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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

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.