This is a story from Panchatantra which teaches us that it is not wise to open our mouth when it is not necessary. This story is as follows:
In a pond lives a tortoise who has two cranes for friends. Once, the lake begins to dry up because of a famine. The cranes decide to fly away to a different pond. The tortoise asks the cranes to take her with them. Listen to this story to learn what happens next.
You can learn more about this story at http://www.gaatha.co/tortoise-cranes-2