1. Behavioural Ecology Group, Department of Systematic Zoology and Ecology, Eöouml;tvöouml;s University, H–1117, Pàzmàny P. sétàny 1/C Budapest, Hungary
2. Laboratoire de Parasitologie Evolutive, CNRS UMR 7103, Université Pierre et Marie Curie, Bâtiment A, Case 237, 7ème étage, 7 quai St Bernard, F-75252 Paris Cedex 5, France
3. Institute for Small Animal Research, H–2101, Isaszegi ut, Göouml;döouml;llõ, Hungary