About the Authors

Donald M. Henderson


Affiliation Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, Canada

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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