1. Applied Zoology and Animal Conservation Research Group, Department of Biology, University of the Balearic Islands (UIB), Ctra. Valldemossa Km 7.5, Palma de Mallorca, Spain
2. Centre for Ecology and Hydrology, Oxfordshire, United Kingdom
3. Department of Animal Pathology, Faculty of Veterinary, University of Zaragoza, Zaragoza, Spain
4. Centre for Ecology and Hydrology, Bush Estate, Edinburgh, Scotland