The Fox and the Sick Lion is the well-loved story based on an Aesop’s Fable, where a fox follows some tracks to a cave where a sick lion lives. The fox sees many animals go into the cave. The lion invites the fox in, but the fox realises that the tracks go in but they don’t come out, so he walks away.
The moral of the story is: Clever people see what happens to others and they walk away from danger.