About the Authors

Marina Davila-Ross

Affiliation Centre for Comparative and Evolutionary Psychology, Psychology Department, University of Portsmouth, Portsmouth, United Kingdom

Goncalo Jesus

Affiliation Department of Anthropology, University College London, London, United Kingdom

Jade Osborne

Affiliation Centre for Comparative and Evolutionary Psychology, Psychology Department, University of Portsmouth, Portsmouth, United Kingdom

Kim A. Bard

kim.bard@port.ac.uk

Affiliation Centre for Comparative and Evolutionary Psychology, Psychology Department, University of Portsmouth, Portsmouth, United Kingdom

Competing Interests

Kim Bard is a PLOS ONE Editorial Board member, but this does not alter the authors' adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

Conceived and designed the experiments: MDR KAB. Performed the experiments: MDR. Analyzed the data: MDR. Wrote the paper: MDR KAB. Coded videotapes: GJ JO MDR.