Funding for this research was provided by:
Harry Crossley Foundation (2020)
South African Medical Research Council (86949)
American Association of Zoo Veterinarians (S005651)
Received: 13 February 2020
Accepted: 19 June 2020
First Online: 29 June 2020
: Ethical approval for this project was granted by Stellenbosch University Animal Care and Use Committee (ACU-2018-0966; ACU-2019-6308 and ACUACU-2019-9081) and section 20 research permits issued by the Department of Agriculture, Forestry and Fisheries (Ref: 12/11/1/7/2; 12/11/1/7/5 and 12/11/1/7/6).
: Not applicable.
: The authors declare that they have no competing interests.