1. Research Unit of Behavioural Ecology, Ethology and Wildlife Management, Department of Life Sciences, University of Siena, Via P.A. Mattioli 4, IT-53100 Siena, Italy
2. Council for Agricultural Research and Economics, Agrobiology and Pedology Research Centre (CREA-ABP), Via Lanciola 12/A, Cascine del Riccio, IT-50125 Firenze, Italy
3. Czech University of Life Sciences (Č.Z.U.), Faculty of Forestry and Wood Sciences, Department of Game Management and Wildlife Biology, Kamýcká 961/129, CZ-165 21 Prague, Czech Republic
4. Czech University of Life Sciences (Č.Z.U.), Faculty of Agrobiology, Food and Natural Resources, Department of Animal Husbandry and Ethology, Kamýcká 961/129, CZ-165 00 Prague, Czech Republic
5. Institute of Animal Science (V.Ú.Ž.V.), Department of Ethology, Přáteiství 815, CZ-10400 Prague, Czech Republic