Falsehood in examples
Examples are used to explain, understand and remember some intellectual concepts. Sometimes, animals are shown as conversing among themselves. (For example, there is a poem by Allamah Iqbal where a squirrel advises the mountain to give up pride). Now everyone knows that such things are not possible so there is no risk of anyone having a misunderstanding. On the other hand they serve a useful purpose. Hence such examples are permitted. We find such types of examples in the narrations of Ahl ul-Bayt (a.s.).
Moreover there are also narrations that prove the permissibility of explaining facts and truthful concepts through the media of stories and anecdotes.