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Pigs have a bad rap ....
Pigs do not have functional sweat glands [2], so pigs cool themselves using water or mud during hot weather. They also use mud as a form of sunscreen to protect their skin from sunburn. Mud also provides protection against flies and parasites.
Pigs are generally considered to be one of the more intelligent animals on the planet, being compared to dogs [3]. In one study conducted by a Pennsylvania State University professor, two pigs were taught to play rudimentary video games by manipulating a joy stick with their snouts while being rewarded with sweets [4].
It has been shown that a pig's mood can be determined by its tail, if the tail is tightly coiled, the pig is happy. If the tail is hanging limp however, the pig is unhappy
Source: Wikipedia
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