1. School of Biological Sciences, Queen Mary College, University of London, London E1 4NS, U.K.
2. Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná 8, 603 65 Brno, Czech Republic
3. Department of Ecology and Vertebrate Zoology, University of Łodz, Banacha 12/16, 90‐237 Łodz, Poland