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Warthogs lack a thick coat of hair and have little body fat, and are therefore susceptible to cold and wet weather. Similarly, during hot summer months they are poorly protected against the scorching sun. By wallowing in mud they are able to reduce their body temperature by as much as 7ºC, and mud packs also help to protect their skin from biting insects. After wallowing in mud, a convenient tree stump always serves as a rubbing post and helps locate itchy spots missed by the mud.