The most impressive aspect of the living world is it’s diversity. Ernst Mayr: "This is Biology"

From April to November 2006 I have been at the University Turku, Finland, to work on interactions between two species of owls (Aegolius funereus and Glaucidium passerinum) and pied flycatchers (Ficedula hypoleuca).

It will take some time to present this here, if I am going to do it at all. So far I would like to point your interest on a publication to which I have significantly contributed in setting the experiment and collection data of one season:
Axel & ATNistkastenherstellung 01Aegolius funereus 02Axel Raufußkauz
Click to enlarge