About the Authors

John A. Whitlock


Affiliation Museum of Paleontology, University of Michigan, Ann Arbor, Michigan, United States of America

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.