About the Authors
- Stephen R. Ross
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* E-mail: sross@lpzoo.org
Affiliation Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, Illinois, United States of America
- Vivian M. Vreeman
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Affiliation Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, Illinois, United States of America
- Elizabeth V. Lonsdorf
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Affiliations Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, Illinois, United States of America, Committee on Evolutionary Biology, University of Chicago, Chicago, Illinois, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: SR EL VV. Performed the experiments: SR VV. Analyzed the data: SR VV EL. Contributed reagents/materials/analysis tools: SR EL. Wrote the paper: SR EL VV.