On the the 20th of April 2010 Zbyszek Kajzer observed a Common Pochard (Aythya ferina) with nasal saddles C OX. The bird was obserwed with other ducks on settlers in Police Chemical Factory. There is lots of pollution like industrial sewage, biological sewage and many others... so don't know at all why birds like this place.
I"ve tried to find out some information about marked Common Pochard on the Cr-Birding... but it could be a french bird and german as well, any ideas?
fot. Zbyszek Kajzer