1. a Percy FitzPatrick Institute of African Ornithology , University of Cape Town , Rondebosch, South Africa , 7700
2. b Coastal Research Unit of Zululand, Department of Zoology , University of Zululand , Private Bag X1001, KwaDlangezwa, South Africa , 3886
3. c Department of Zoology , University of Port Elizabeth , P. O. Box 1600, Port Elizabeth, South Africa , 6000
4. d Natal Parks Board , P. O. Box 62, St Lucia Estuary, South Africa , 3936
5. e Cape Nature Conservation , P. O. Box 94, Walvis Bay, South Africa , 9190