Larus cachinnans

(last update: February 16, 2013)

Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)


cachinnans plumages

Larus cachinnans 1CY PKAZ August 29 2011, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Yellow PKAZ and metal PLG DN-27654; ringed as pullus on May 26 2011 at Kozielno, Paczkow, S-SW Poland, (50°29' N,  16°58' E).

PKAZ 26-5-2011 ZB. Kozielno, Paczkow 50°29' N 16°58' E
PKAZ 29-8-2011 Deponie Pohlsche Heide 52°23' N 08°46' E

In this area are mixed breeding colonies (near Katowice), with far most birds breeding here are cachinnans, but in this area also records of very few michahellis from the south (e.g. ringed female from Italy) and argentatus from eastern Germany are possible (see PDF).

Will probably develop into a fine adult cachinnans, but several features slightly odd for cachinnans and in some respect better fit to juvenile michahellis.
Note short legs, michahellis-like tertial pattern, extensive scapular moult with bold anchor pattern, extensive coverts moult with again bold pattern on 2nd gen coverts, very limited white in central and outer GC, medium brown inner-webs of inner primaries and therefore not much contrast to outerwebs (hence venetian blind effect largely lacking).

Still head shape and bill shape nice for cachinnans.