Keeping this in view, why do pigs need mud?
Just because pigs like to roll in mud, don't assume that they're dirty animals. To help protect their skin from sunburn, pigs use mud as a form of sunscreen. When mud dries on their skin, it forms a barrier against the sun's harmful ultraviolet rays. A good thick layer of mud also helps to protect pigs from insects.
Secondly, what type of glands do pigs not have and so must wallow in mud to beat the heat? A: Sweat glands.
One may also ask, do pigs need mud to survive?
Wallowing in the mud is for sure good fun for pigs, but it also has several practical benefits, like keeping swine cool. Some wild pigs seem to use mud baths to scrape off parasites such as ticks and lice; they may also rub their scent glands around wallowing areas, possibly as a way of territory marking.
Are pigs smart?
Pigs are smarter than any other domestic animal. Their ability to solve problems, like the pig I.Q. test on The Joy of Pigs, is well-documented, and they are considered by animal experts to be more trainable than dogs or cats. Pigs are difficult to classify.