Larus cachinnans

(last update: February 16, 2013)

Coordinator:
Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)

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cachinnans plumages

Larus cachinnans 2CY PHNP July 05 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Yellow PHNP and metal PLG DN-27519; ringed as pullus on May 26 2011 at Kozielno, Paczkow, S-SW Poland, (50°29' N,  16°58' E).

Recoveries:
PHNP 26-5-2011 ZB. Kozielno, Paczkow pull 50°29' N 16°58' E
PHNP 5-7-2012 Deponie Pohlsche Heide 2cy 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).

PHNP is cachinnans. Bird in complete moult. All MC replaced, inner GC replaced and moult wave progressing outwards. Outer GC replaced and moult wave going inwards, still a gap there, but all old juvenile GC dropped. Last old juvenile coverts still present in carpal edge. Upper TT replaced, lower TT still juvenile.

P1-P5 new, P6 growing, P7 missing, P8-P10 old juvenile. S1 growing, other secondaries old. R1-4 missing, R5-6 still old juvenile.

New primaries with pattern reminiscent of 3rd gen primaries: inner primaries almost completely grey and central primaries P4-P5 with sub-terminal band. However, in these 2nd gen primaries this sub-terminal band is often brownish and with diffuse borders. And normally on P5 a clear white tip is missing in 2nd gen P5.