About the Authors

T. M. F. N. van de Ven

tmfnvandeven@gmail.com

Affiliation Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Cape Town, 7701, South Africa

R. O. Martin

Affiliation Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Cape Town, 7701, South Africa

T. J. F. Vink

Affiliation Institute for Coastal and Marine Research, Department of Botany, Nelson Mandela Metropolitan University, Port Elizabeth, 6031, South Africa

A. E. McKechnie

Affiliation DST-NRF Centre of Excellence at the Percy FitzPatrick Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria, 0002, South Africa

S. J. Cunningham

Affiliation Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Cape Town, 7701, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ROM SJC AEM TMFNV. Performed the experiments: TMFNV. Analyzed the data: TMFNV TJFV SJC. Wrote the paper: TMFNV ROM SJC AEM TJFV.