About the Authors

Lynne A. Isbell
Department of Anthropology and Animal Behavior Graduate Group, University of California Davis, Davis, California, United States of America

Truman P. Young
Department of Plant Sciences and Graduate Group in Ecology, University of California Davis, Davis, California, United States of America

Alexander H. Harcourt
Department of Anthropology and Graduate Group in Ecology, University of California Davis, Davis, California, United States of America

Corresponding Author

laisbell@ucdavis.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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