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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Caspian Gull cachinnans (hybrid) 0.U 1CY, May - October 2022, De Kreupel, Almere & Wassenaarseslag, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia red 0.U and metal NLA 5.620.235, ringed as pullus hybrid Caspian Gull (Larus cachinnans) on 13-05-2022 at colony De Kreupel (IJsselmeer), the Netherlands (NL 5247.00 n 513.00 E), by ringer Leon Kelder.

Recoveries:
17-08-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
18-08-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Roland-Jan Buijs
14-10-2022 Katwijk aan Zee (Strand), Zuid-Holland, NL 5.213,00 N 424,00 E colourring read Thijs Horst & Mars Muusse
22-10-2022 Wassenaarseslag (Strand), Zuid-Holland, NL 5.213,00 N 424,00 E colourring read Mars Muusse

Bird from De Kreupel, nest C5 on island C. Data for this nest:

Date: Egg code Height (mm)  Width (mm) Comments Metal NLA Colour ring Wing (mm) Head+ bill (mm) Bill Mass (gr) Tarsus Gonys Swab no
14-4-2022 A-egg 72.7 51.8 2 eggs
B-egg 74.1 52.8
 
29-4-2022 Adult trapped Caspian x Herring 6214033 Red 0.A 441 123.5 57.5 933 71.4 17.8 1064
13-5-2022 3 pulli in nest 5620234 Red 0.T 55.0 98
5620235 Red 0.U 55.1 101
5620236 Red 0.V 50.9 70

below: Caspian Gull cachinnans (hybrid) 0.U 1CY, October 22 2022, Wassenaarseslag beach, the Netherlands. Picture: Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 0.U 1CY, August 17 2022, Almere, the Netherlands. Picture: Thijs Horst.