Larus cachinnans in the Netherlands

(last update: August 16, 2020)
Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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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

Caspian Gull cachinnans hybrid 6.Z 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[6.Z] and metal NLA 5.625.138, ringed as pullus Larus cachinnans hybrid at nest 18 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain in 2022: one parent is adult cachinnans, other parent is adult argentatus.

Visits and data 2022:
Estimation egg laying: A-egg = April 17 2022. Estimating hatching = May 15 2022.
   
29-04-2022 Nest located and eggs measured.
  One parent is female Herring Gull. Other parent is aggressive male Caspian Gull.
  egg no: width (mm) length (mm) volume (cm3):  water test on May 6th:  3 eggs in nest.
  A 48,6 72,9 -- floating - halfway.      
  B 47,8 70,5 -- 90 - tip bottom.      
  C 48,7 71,4 -- 90 - tip bottom.      
   
17-05-2022   metal NLA colour age        
  pullus .5625137 - <2 days old        
  pullus .5625138 - <2 days old        
  egg just hatching.      
   
30-05-2022   metal NLA colour age mass wing H+B Bill
  pullus .5625138 r-6Z <2 days old 444 91 80,2 34,3
  pullus .5625177 r-60 <2 days old 327 60 74,7 27,1
  egg just hatching.      

below: Caspian Gull cachinnans hybrid 6.Z 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[6.Z] hybrid cachinnans from nest 18 (226). Picture: May 30th, 2022.
Ringed on May 30th. No observations since. Same for sibling r[6.0]. Sibling NLA5625137 ringed on May 17th. No observations since for this one either.