1 Grupo de Investigaciones en Biología de la Conservación, Laboratorio Ecotono, INIBIOMA, Universidad Nacional del Comahue-CONICET, San Carlos de Bariloche, Argentina.
2 Animal Demography and Ecology Unit, Institute for Mediterranean Studies (IMEDEA), Esporles, Spain.
3 FitzPatrick Institute of African Ornithology, University of Cape Town, Cape Town, South Africa.
4 Balearic Biodiversity Centre, Department of Biology, University of the Balearic Islands, Palma, Spain.