Erik MatthysenErik Matthysen is Research Associate at the Department of Biology of the University of Antwerp, Belgium. He has studied Eurasian Nuthatches in the field for over fifteen years, starting with an undergraduate thesis project in 1982. His main reearch interests are social organisation, dispersal strategies and population structure, mainly in birds and insects. He is married with two children and lives in Rumst near Antwerp. Read More Read Less