About the Authors

Federica Amici

abbepu@yahoo.it

Affiliation Department of Comparative and Developmental Psychology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Bradley Barney

Affiliation Department of Mathematics and Statistics, Kennesaw State University, Kennesaw, Georgia, United States of America

Valen E. Johnson

Affiliation Department of Biostatistics, M.D. Anderson Cancer Center, Houston, Texas, United States of America

Josep Call

Affiliation Department of Comparative and Developmental Psychology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Filippo Aureli

Affiliations Instituto de Neuroetologia, Universidad Veracruzana, Xalapa, Veracruz, Mexico, Research Centre in Evolutionary Anthropology and Palaeoecology, Liverpool John Moores University, Liverpool, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: F.Amici JC F. Aureli. Performed the experiments: F.Amici JC. Analyzed the data: BB VEJ. Contributed reagents/materials/analysis tools: F.Amici JC F. Aureli BB VEJ. Wrote the paper: F.Amici.