About the Authors

Ki Andersson

andersson.ki@gmail.com

Affiliations Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom, Department of Palaeozoology, Swedish Museum of Natural History, Stockholm, Sweden

David Norman

Affiliation Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom

Lars Werdelin

Affiliation Department of Palaeozoology, Swedish Museum of Natural History, Stockholm, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KA. Performed the experiments: KA. Analyzed the data: KA. Contributed reagents/materials/analysis tools: KA LW. Wrote the paper: KA LW DN. Planned the project, designed the study, collected data, analysed data and wrote the manuscript: KA. Discussed the project in detail and contributed to developing the manuscript and finished the paper: DN LW.