1. Department of Geography, History and Environmental Studies, University of Namibia, Windhoek, Namibia
2. Department of Zoology, School of Mathematical and Natural Sciences, University of Venda, Thohoyandou, South Africa
3. Independent Researcher, R1 de Agosto, Xangongo, Angola
4. Ministry of Agriculture, Water and Forestry, Department of Water Affairs and Forestry, Cuvelai–Etosha Basin, Oshakati, Namibia