Pigs have no functional sweat glands, and is one big reason why they love mud.
One of the ways pigs keep cool is by wallowing in the mud in hot weather.
Pigs also use mud as a form of sunscreen to protect their little pink hides and ears from the scorching sun.
The mud dries on their skin, forming a barrier against ultraviolet rays, and helps prevent sunburn.
Mud also provides pigs protection against flies and parasites.
Pigs have developed a reputation for being dirty animals as a result of their wallowing in mud, but are actually pretty clean animals.
In fact, given a choice, pigs would probably not spend any time rolling in the mud at all.