1. Institute of Environment, Department of Biological Sciences, Florida International University, 3000 NE 151 St., North Miami, FL 33181, USA
2. Department of Zoology and Entomology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
3. Department of Botany and Zoology, University of Stellenbosch Cape Town, South Africa, c/o Sea Search Research and Conservation NPC, 4 Bath Road, Muizenberg, Cape Town 7945, South Africa
4. Animal Demography Unit, Department of Biological Sciences, Private Bag X3, University of Cape Town, Rondebosch 7701, South Africa
5. SEACODE and Namibia Nature Foundation, PO Box 583, Lüderitz 9000, Namibia