About the Authors

Richard W. R Retallick

Affiliations School of Tropical Biology, James Cook University, Townsville, Queensland, Australia, Department of Zoology and Entomology, University of Queensland, St Lucia, Queensland, Australia, School of Life Sciences—Biology, Arizona State University, Tempe, Arizona, United States of America

Hamish McCallum

To whom correspondence should be addressed. E-mail: hmccallum@zen.uq.edu.au

Affiliation Department of Zoology and Entomology, University of Queensland, St Lucia, Queensland, Australia

Rick Speare

Affiliation Amphibian Diseases Group, School of Public Health and Tropical Medicine, James Cook University, Townsville, Queensland, Australia

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

RWRR and RS conceived and designed the experiments. RWRR performed the experiments. HIM analyzed the data. HIM wrote the paper.