People do not agree what a fairy tale exactly is. Some argue that a story with fairies or other magical beings in the story would make it a fairy tale. However, others have suggested that the expression began when the French expression "conte de fées" was being translated (it was first used by Madame D'Aulnoy in 1697). Vladimir Propp criticized the difference between "fairy tales" and "animal tales" in his book "Morphology of the Folktale". He said that many stories had both fantastic qualities and animals. He suggested that fairy tales could be recognized by their story, but this has been criticized, because the same stories can be found in stories that are not fairy tales.