1. Conservation Biology Research Group, Department of Anatomy, Cell Biology and Zoology, Faculty of Sciences, University of Extremadura, 06006 Badajoz, Spain
2. Conservation Biology Research Group, Department of Plant Biology, Ecology and Earth Sciences, Faculty of Sciences, University of Extremadura, 06006 Badajoz, Spain
3. Bird Ecology Lab, Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile