The Nun's Priest's Tale is one of Chaucer's most brilliant tales, and it functions on several levels. The tale is an outstanding example of the literary style known as a bestiary (or a beast fable) in which animals behave like human beings. Consequently, this type of fable is often an insult to man or a commentary on man's foibles. To suggest that animals behave like humans is to suggest that humans often behave like animals.