1. a 21 Binnekringweg, Dalsig, Stellenbosch, South Africa
2. b P.O. Box 442, Stellenbosch, 7600, South Africa
3. c P.O. Box 54, Newlands, 7725, South Africa
4. d Max-Planck-Institut für Verhaltensphysiologie , D-8131, Seewiesen, West Germany
5. e Dept. of Zoology , University of Cape Coast , Ghana
6. f Culterty Field Station , Newburgh by Ellon, Aberdeenshire, AB4 OAA, Scotland
7. g 32 Southy Road, Farrarmere, Benoni, 1500, South Africa
8. h Transvaal Nature Conservation Division , Private Bag X209, Pretoria, 0001, South Africa
9. i Transvaal Nature Conservation Division, Nylsvley Nature Reserve , P.O. Boekenhout, 0561, South Africa
10. j Natal Parks, Game and Fish Preservation Board , P.O. Box 662, Pietermaritzburg, 3200
11. k Sea Fisheries Branch , Foreshore, Cape Town, 8001, South Africa
12. l Department of Zoology , University of Natal , Pietermaritzburg, 3200, South Africa