www.gull-research.org

Hi everyone!

Is this too dark underwing for cach? Are there some arg genes in it?
I took this last Saturday on jakuševec, Zagreb? It was ringed in May 2014 in cach colony of ZB.KOZIELNO,PACZKÓW..

I aslo found two Slovakian cach and they also look preety dark to me. Photos on my blog http://cro-ringing.blogspot.com/

cheers
Luka

Hi Luka,
I think this would still be okay within the limits of cachinnans. After all, Kozielno is an almost homogeneous population:
http://gull-research.org/cachinnans/1cy/fig4vw2006.html

from:
http://gull-research.org/cachinnans/05cymar.html