About the Authors
Department of Zoology, University of Cambridge, Cambridge, United Kingdom
Conservation Science Program, World Wildlife Fund–US, Washington, DC, United States of America
Fauna and Flora International, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: AB RN MW AM. Performed the experiments: AB JB JG RN MW AM. Analyzed the data: AB JB JG AM. Wrote the paper: AB RN AM. Obtained grant: AB.