Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PDFMP3_141768)
Text and Data Mining valid from 2018-04-25
Received: 22 April 2017
Revised: 28 February 2018
Accepted: 5 April 2018
First Online: 25 April 2018
Compliance with ethical standards
: All data collection adhered to ASAB guidelines. All research was conducted under the permission of the ethical committee of Pretoria University (EC031-13) and the Northern Cape Conservation Service, South Africa (Permit number: FAUNA 192/2014).
: The authors declare that they have no conflict of interest.