About the Authors

Johan Lindgren

johan.lindgren@geol.lu.se

Affiliation Department of Earth and Ecosystem Sciences, Lund University, Lund, Sweden

Michael W. Caldwell

Affiliations Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada

Takuya Konishi

Current address: Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, Canada

Affiliation Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada

Luis M. Chiappe

Affiliation The Dinosaur Institute, Natural History Museum of Los Angeles County, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JL MC TK. Performed the experiments: JL MC TK. Analyzed the data: JL MC TK. Contributed reagents/materials/analysis tools: LC. Wrote the paper: JL MC TK LC.