Warthogs (Phacochoerus africanus or Phacochoerus aethiopicus) wallowing in a waterhole. Wallowing in mud serves three main purposes. Firstly to get rid of insects and parasites, secondly to help with thermoregulation and thirdly the mud acts as a sunscreen. Once the mud hardens, the warthog will rub itself against a rock or tree stump removing the dry mud and any parasites such as ticks, which are trapped in the dry mud. Warthogs, like pigs, don't have sweat glands to cool themselves. Filmed in Zimanga private game reserve, Kwa-Zulu Natal, South Africa.