About the Authors

Ted W. Cranford

tcranfor@mail.sdsu.edu

Affiliation Department of Biology, San Diego State University, San Diego, California, United States of America

Petr Krysl

Affiliation Department of Structural Engineering, University of California San Diego, La Jolla, California, United States of America

Mats Amundin

Affiliations Department of Research and Education, Kolmarden Wildlife Park, Kolmarden, Sweden, Department of Physics, Chemistry and Biology, Linköpings University, Linköping, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TWC PK MA. Performed the experiments: TWC PK MA. Analyzed the data: TWC PK MA. Contributed reagents/materials/analysis tools: TWC PK MA. Wrote the paper: TWC PK MA.