About the Authors

Lynne A. Isbell

laisbell@ucdavis.edu

Affiliation Department of Anthropology and Animal Behavior Graduate Group, University of California Davis, Davis, California, United States of America

Truman P. Young

Affiliation Department of Plant Sciences and Graduate Group in Ecology, University of California Davis, Davis, California, United States of America

Alexander H. Harcourt

Affiliation Department of Anthropology and Graduate Group in Ecology, University of California Davis, Davis, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: LAI. Wrote the paper: LAI TPY AHH.