Yes, yes they can. Most people opt for the less messy approach and use the sunscreen made in a lab, but people and animals have been using simple mud as sunscreen for centuries. Just be sure to get a thick, even coat, and reapply when your mud-screen dries and starts to flake off.
Yes infact they do use mud for sun screen!
salt and sunscreen
Pigs lie in mud to cool themselves down and to prevent themselves from getting sunburns. Since a pig's skin is so unprotected, just as ours is, they use mud as a sort of completely natural, but utterly smelly, sunscreen.
Yes, the mud acts as a sunscreen, protects from insect bites and helps skin cooling.
No, sunscreen is a very poor analogy for global warming.
To save themselves from the heat of the sun. They often blow dust on themselves or roll in the mud and use the dirt/mud as sunscreen. The rough skin could be so that dirt sticks to it more easily.
The mud helps to keep them cool, and it also kills ticks and lice.
Early humans settled there and made homes that were made of mud bricks.
human are made of flesh and bone not mud and sand
Pigs enjoy being in mud because it is a way to cool down and it also acts as a sunscreen for them. Further, it gets rid of parasites that might be bothering them.
they use it as an insect repellant
Because (a) it cools the skin, (b) stops ticks biting the animal and (c) acts as a natural sunscreen.