1. Institute for Coastal and Marine Research, Marine Apex Predator Research Unit, Department of Zoology; Nelson Mandela University; PO Box 77000 Port Elizabeth 6031 South Africa
2. UP Stable Isotope Laboratory; Mammal Research Institute, University of Pretoria; Private Bag X20 Hatfield 0028 South Africa
3. Port Elizabeth Museum; PO Box 13147 Humewood Port Elizabeth 6013 South Africa