Pigs get a bad rap. Americans often equate them with being grubby, gluttonous, and greedy, despite their highly intelligent and social nature. Calling someone a pig is an insult, and people seem to be more fond of bacon than the creatures themselves. Of all the negative qualities we’ve given pigs, being thrifty is not one of them. So why do we teach children to save money by telling them to stash coins in a hollow receptacle called a piggy bank? To understand this seemingly odd connection, you have to take it back a few hundred years.