1. Department of Agro-forestry; University of Valladolid; Palencia Spain
2. Sustainable Forest Management Research Institute; Palencia Spain
3. FitzPatrick Institute of African Ornithology; Cape Town South Africa
4. Research Unit of Biodiversity (CSIC, UO, PA); University of Oviedo; Oviedo Spain
5. Departamento de Zoología; Facultad de Ciencias; Universidad de Granada; Granada Spain
6. Evolutionary Biology Group (GIBE); Department of Molecular and Cell Biology; University of A Coruña; A Coruña Spain