About the Authors

John R. Horner


Affiliation Museum of the Rockies, Montana State University, Bozeman, Montana, United States of America

Mark B. Goodwin

Affiliation 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: JH MBG. Performed the experiments: JH MBG. Analyzed the data: JH MBG. Contributed reagents/materials/analysis tools: JH MBG. Wrote the paper: JH MBG.