One day, he could not prey upon a single animal after wandering around the jungle in search of food. It was almost sunset, and the lion started returning in spite of being very hungry.
On his way, he saw a big cave, and thought to himself, "It is for sure that some animal must be living in this big cave. Such a nice cave cannot be un-inhabitated. At sunset, whatever animal lives here is bound to return. I shall hide inside the cave and wait for my dinner to arrive."
The cave was the home to a jackal, who arrived a while after the lion had hidden himself inside. While entering he noticed the footprints of the lion leading into the cave, but could not find any footprint coming out.
He thought, "If a lion is indeed entered, I will be dead as soon as I enter. But, how can I be sure? There is no reason for me to stay away from my home if there is no lion inside. I must find out a way to confirm if the lion is still inside."
The jackal thought of a plan, and standing in front of the cave, began to shout, "Hello Cave! Hello Cave! Can I come inside?"
