1. The Czech Academy of Sciences, Institute of Vertebrate Biology, Květná 8, 603 65 Brno, Czech Republic.
2. School of Biology and Bell-Pettigrew Museum of Natural History, University of St Andrews, St Andrews, Fife KY16 9TS, UK.
3. Department of Ecology and Vertebrate Zoology, University of Łódź, Łódź, Poland.
4. Department of Biology, University of Konstanz, Konstanz, Germany.
5. Radcliffe Institute for Advanced Study, Harvard University, 8 Garden Street, Byerly Hall, Cambridge, MA 02138, USA.