Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Nests at De Kreupel 2020
nest r-02P4 20
nest y-X804 20
nest D01 20
nest D02 20
nest D03 20
nest L01 20
nest L02 20
nest L03 20
nest M02 20

Nests at De Kreupel 2021
nest r-02P4 20
nest w-201U 21
nest g-XLHD 21
nest r-KA 21
nest r-KB 21
nest r-KC 21
nest r-KD 21
nest r-KE 21
nest r-KF 21
nest r-KH 21
nest r-KJ 21
nest r-KK 21
nest A01 21
nest C03 21
nest C04 21
nest C06 21
nest D01 21
nest D03 21
nest D05 21
nest D06 21
nest D07 21
nest D08 21
nest E01 21
nest H01 21
nest L01 21
nest L02 21
nest L05 21
nest L06 21
nest L07 21
nest M01 21
nest M04 21
nest M06 21
nest Q01 21

Cachinnans - nest De Kreupel X804 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 "M", positioned at west side.
• One parent is okay for pure cachinnans, yellow X804 from Germany.
• Other parent seems to have no black on P5 and too much black at P10 for pure cachinnans.
• One juvenile ringed: pale blue F+. Tertials with notched fringes and pattern on inner primaries hint to hybrid cachinnans.

location	Parent 1: y[X804]. Date: June 12th, 2020.	Parent 2: unringed. Date: June 12th, 2020.
pullus	May 21st, 2020 pullus p[F+].
juveniles	June 12th, 2020 pullus p[F+].

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