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 6.8 1CY, May - September 2022, Lelystad & Almere, the Netherlands. Picture: Thijs Horst, Mars Muusse & Eric Roeland.

Red tibia ring r[6.8] and metal NLA 5.625.150, ringed as pullus Larus cachinnans hybrid at nest 244 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal - Roland-Jan Buijs ringing team.
ID certain in 2022: one parent is adult Herring Gull argenteus and other parent is sub-adult Caspian Gull cachinnans.

Recoveries:
30-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
02-07-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-08-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
23-09-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
23-09-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
24-09-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
10-04-2023 Westerslag (Strand), Texel, NL 5.302,00 N 442,00 E colourring read Job ten Horn

Bird from nest 244, data for this nest:

4-May-22 3 eggs A egg 65,4 51 floating - 4 mm
B egg 67,8 49 floating - 4 mm
C egg 63,4 47,6 floating - 4 mm
sub-adult cachinnans at this nest.
metal darvic mass wing H+B age
22-May-22 pullus .5625150 - 73 27 50,8 2 days, too small for darvic ring.
pullus .5625151 - 68 24 50,2 2 days, idem.
pullus .5625152 - 60 22 47 1st day, idem.
metal darvic mass wing H+B bill
30-May-22 pullus .5625150 r-68 267 45 67,6 26
pullus .5625151 r-67 258 46 68,1 24
pullus .5625152 r-65 244 38 63,6 23
02-Jun-22 probably Herring Gull at this nest? But be aware of other nest close by.
17-Jun-22 adult Herring Gull neat nest.
21-Jun-22 pullus darvic mass H+B Bill Tarsus Wing
r-68 888 111 42,2 77,5 255

below: Caspian Gull cachinnans hybrid 6.8 1CY, September 24 2022, Almere (De Vaart), the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 6.8 1CY, August 19 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 6.8 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[6.8] cachinnans x argentatus hybrid from nest 244. Picture: May 30th, 2022.
r[6.8] fledged. Sibling r[6.5] & r[6.7] ringed on May 30th. No observations since for these two birds.

below: Caspian Gull cachinnans hybrid 6.8 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.