About the Authors

David G. Delaney

DGDelaney@gmail.com

Affiliations Oceans Research, Mossel Bay, South Africa, Mammal Research Institute, University of Pretoria, Pretoria, South Africa

Ryan Johnson

Affiliations Oceans Research, Mossel Bay, South Africa, Mammal Research Institute, University of Pretoria, Pretoria, South Africa

Marthán N. Bester

Affiliation Mammal Research Institute, University of Pretoria, Pretoria, South Africa

Enrico Gennari

Affiliations Oceans Research, Mossel Bay, South Africa, South African Institute for Aquatic Biodiversity, Grahamstown, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RLJ DGD EG MNB. Performed the experiments: RLJ. Analyzed the data: EG RLJ DGD. Wrote the paper: DGD EG RLJ MNB.