1. Institute of Vertebrate Biology of the Czech Academy of Sciences, Brno, Czech Republic; e-mail: , seidlovav@vfu.cz, zukal@ivb.cz
2. Department of Ecology and Diseases of Zoo Animals, Game, Fish and Bees, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic; e-mail: , H20363@vfu.cz