About the Authors

John A. Whitlock
Museum of Paleontology, University of Michigan, Ann Arbor, Michigan, United States of America

Corresponding Author

jawhitl@umich.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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