1. Natural History Museum; University of Oslo; PO Box 1172 Blindern 0318 Oslo Norway
2. Centre for Ecological and Evolutionary Synthesis, Department of Biosciences; University of Oslo; PO Box 1066 Blindern 0316 Oslo Norway
3. Institute of Vertebrate Biology; Academy of Sciences of the Czech Republic; Brno 603 65 Czech Republic
4. Faculty of Sciences; Charles University in Prague; Praha 12844 Czech Republic
5. Department of Biological Sciences; University of Toronto Scarborough; Toronto Ontario Canada M1C 1A4