1. Department of Zoology , National Museum (Natural History) , Václavské nám. 68, CZ–115 79 Praha 1 , Czech Republic
2. Department of Zoology, Faculty of Science , 37740 Charles University , Viničná 7, CZ–128 43 Praha 2 , Czech Republic
3. Faculty of Forestry and Wood Sciences , Czech University of Life Sciences , Kamýcká 129, CZ–165 21 Praha 6 , Czech Republic
4. Department of Environmental Science, School of Science , 99404 University of Namibia , Windhoek , Namibia
5. National Museum of Namibia , Windhoek , Namibia
6. Department of Mammalogy , National Museum , Bloemfontein , South Africa
7. Centre for Environmental Management , University of the Free State , Bloemfontein , South Africa