About the Authors

John R. Wible

wiblej@carnegiemnh.org

Affiliation Section of Mammals, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, United States of America

Michelle Spaulding

Affiliation Section of Mammals, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JRW MS. Performed the experiments: JRW MS. Analyzed the data: JRW MS. Contributed reagents/materials/analysis tools: JRW MS. Wrote the paper: JRW MS.