John-G Robinson is vice president and director of International Conservation at the Wildlife Conservation Society and is the editor, with K-H Redford, of "Neotropical Wildlife Use and Conservation". He has written extensively on tropical forest conservation and the sustainable use of natural resources. Elizabeth-L Bennett is senior conservation zoologist at the Wildlife Conservation Society and is the author of more than fifty scientific and popular articles on wildlife and conservation in Malaysia. Her writings include "The Natural History of Orang-Utan", and, with F Gombek, "Proboscis Monkeys of Borneo".