Joy of mud

Look at them! They are, as the saying goes, “happy as a pig in mud” :).  Pigs don't perspire, and so wallow in mud to keep themselves cool in a hot day. They are naturally very clean animals and, if given the choice, they prefer to cool themselves down in fresh water.  
Watching this five friends playing, you can see how much they really enjoy it. I wish all pigs in the world felt the smell of fresh grass and the joy of wallowing in the mud.