1. Centro Interdisciplinare di Bioacustica e Ricerche Ambientali, Department of Earth and Environment Sciences, University of Pavia, Pavia, Italy
2. Eurafrica Conservation Projects, Non-Profit Organization for the Conservation of Biodiversity, Rome, Italy
3. Reparto Carabinieri Biodiversità, Centro Ricerche Ambienti Montani, Castel di Sangro (AQ), Italy