Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse


Cachinnans - nest Lelystad 039

General remarks:

  • Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
  • Nest 039 positioned in dense patch of Blackberries.
  • Both are assumed to be Caspian Gull cachinnans. Female is missing 1 foot.
  • Nest only located late in the season, by early June 2020. 2 eggs measured, showing small cracks. Chicks will hatch within the next days.
  • In 2021 the 'one-legged woman' present again in March, but no subsequent observations. Maybe nest 39 = nest 72?
location June 2nd, 2020: partners on look-out (female on rock). June 2nd, 2020: 2-eggs clutch. .
partner 1 June 2nd, 2020: female. June 2nd, 2020: female. March 23rd, 2021: again present.

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):  egg condition on June 2nd: laying date:  
02-06-2020 A 50,8 68,7 89,27 small cracks May 4th  
02-06-2020 B 50,7 64,8 83,87 small cracks May 4th
sum nest: --
24-03-2021 Adult on blocks, it is female with missing left foot.
26-04-2021 No bird present.
13-05-2021 No visit, Camilla is trapping a Spoonbill.
15-05-2021 3 eggs in a nest located 3 meters east of marked block. Marking "39" sprayed again to make it more visible.
08-06-2021 Herring Gull at this location.