About the Authors
- Sadie J. Ryan
- Department of Environmental and Forest Biology, SUNY College of Environmental Science and Forestry, Syracuse, New York, United States of America
- Peter D. Walsh
- Department of Archaeology and Anthropology, University of Cambridge, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
Analyzed the data: SJR PDW. Contributed reagents/materials/analysis tools: SJR PDW. Wrote the paper: SJR PDW.