1. Institute for Electromagnetic Sensing of the Environment, Consiglio Nazionale delle Ricerche, Via Corti 12, 20133 Milano, Italy
2. Department of Earth and Environmental Sciences, Università di Pavia, Via Ferrata 9, 27100 Pavia, Italy
3. Alpine Wildlife Research Centre, Parco Nazionale Gran Paradiso, Fraz. Dégioz 11, 11010 Valsavarenche (AO), Italy
4. Department of Veterinary Medicine, Università di Bologna, Via Tolara di Sopra 50, 40064 Ozzano dell'Emilia (BO), Italy
5. Department of Agri-Food Production Sciences and the Environment, Università di Firenze, Via delle Cascine 5, 50144 Firenze, Italy
6. Conservation Biology Research Group, Department of Biological Sciences, University of Chester, Parkgate Road, Chester, CH1 4BJ, United Kingdom