About the Authors

Nicholas D. Pyenson


Affiliations Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., United States of America, Departments of Mammalogy and Paleontology, Burke Museum of Natural History and Culture, University of Washington, Seattle, Washington, United States of America

David R. Lindberg

Affiliation Department of Integrative Biology, Center for Computational Biology and Museum of Paleontology, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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