About the Authors

David J. Humphries

davidhumphries@outlook.com

Affiliations Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia, Pied Babbler Research Project, Kuruman River Reserve, Van Zylsrus, South Africa

Fiona M. Finch

Affiliation Pied Babbler Research Project, Kuruman River Reserve, Van Zylsrus, South Africa

Matthew B. V. Bell

Affiliations Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom, Pied Babbler Research Project, Kuruman River Reserve, Van Zylsrus, South Africa

Amanda R. Ridley

Affiliations Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia, DST/NRF Centre of Excellence at the Percy FitzPatrick Institute, University of Cape Town, Cape Town, Western Cape, South Africa, Pied Babbler Research Project, Kuruman River Reserve, Van Zylsrus, South Africa, Centre for Evolutionary Biology, School of Animal Biology, University of Western Australia, Perth, WA, Australia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DJH ARR. Performed the experiments: DJH FMF. Analyzed the data: DJH. Contributed reagents/materials/analysis tools: DJH MBVB ARR. Wrote the paper: DJH MBVB FMF ARR.