About the Authors

David J. Varricchio

djv@montana.edu

Affiliation Department of Earth Sciences, Montana State University, Bozeman, Montana, 59717, United States of America

Amy M. Balanoff

Affiliation Department of Anatomical Sciences, Stony Brook University School of Medicine, Stony Brook, NY, 11794, United States of America

Mark A. Norell

Affiliation Division of Paleontology, American Museum of Natural History, New York, NY, 10024, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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