About the Authors
- John R. Horner
- Museum of the Rockies, Montana State University, Bozeman, Montana, United States of America
- Mark B. Goodwin
- Museum of Paleontology, University of California, Berkeley, California, United States of America
The authors have declared that no competing interests exist.
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.