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 De Kreupel D02 20

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 on island "D", positioned in SE corner.
  • One parent is pure cachinnans, colour-ringed but code uncertain.
  • Two large pulli ringed, late in season. Both birds: pale inner primaries (pale window) and tertial pattern, together with obvious gonys angle on one bird, may hint to argenteus blood.
location Parent is colour-ringed. Date: June 12th, 2020.  
juveniles June 12th, 2020 pullus p[FA]. June 12th, 2020 pullus p[FB].

Visits and data.

date:     WING: HEAD + BILL: BILL: WEIGHT: Comments:    
12-6-2020 pullus NLA 5.545.451 & p[FA] 306.5 118.2 47.9 1108 2 pulli ringed at colour-ringed parent nest.
12-6-2020 pullus NLA 5.545.452 & p[FB] 279.5 108.5 44.1 880