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 066

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 066 on breakwater dam 1 at north side, section with dense vegetation. 2 meters west of nest 72 ("66" marked on blocks in front of Blackberry complex). But position unclear, about 8 meters east of the willow in the dam-curve.
  • ID for nest 066 uncertain in 2021, female is Caspian Gulls cachinnans. Limited data.
partner 1: April 26th, 2021. April 26th, 2021: female cachinnans. April 26th, 2021: female cachinnans.
partner 1: May 6th, 2021. . .
partner 1: June 8th, 2021. June 8th, 2021. June 8th, 2021.

Visits and data.

26-04-2021 Alarming and patrolling female cachinnans over the canoe. No landmade efforts.
06-05-2021 1 egg hatching; 1 chick is 1 day old.
15-05-2021 Uncertainty about location. Long intense search for nests 66 & 72, no eggs / no chicks, but alarming parent over head. Dense vegetation doesn't help.
  One blck marked red spot with white circle, 5 meters behind this is an empty nest. Was 66???
Chicks present in dense vegetation, but impossible to find and search here without the problem of stepping on a chick.
28-05-2021 No visit.
08-06-2021 Again, an alarming adult lands near the willow, the old location (26-04). Do the pulli hide here?