Yes, pigs are legal. However, keeping them in certain places is not. You will have to check the zoning laws for your specific community to determine whether there are regulations for keeping farm animals. And it can be applied to pet pigs as well.
A group of swine is called a sounder or drift
more than humans but less than sheep in wales... O_O theres frikin loads
Roll in the mud......they also do that to cool themselves on a hot day.