Received: 27 October 2019
Accepted: 4 April 2020
First Online: 15 April 2020
Compliance with ethical standards
: The authors declare they have no conflict of interest.
: This research was conducted under ethical clearance from the Animal Ethics Committee, University of Cape Town (2012/V44/PH and 2013/V24/PR); and permits from the Northern Cape Department of Environment and Nature Conservation of South Africa (995/2012, 660/2013 and 1166/2013). All applicable institutional and/or national guidelines for the care and use of animals were followed.