It talks about the principle that "we should not remain static when encountering difficulties. We can often avoid big risks by adapting to circumstances." The original title of the story of the bat was "The Bat and the Weasel", which was intended to be a satire on people who have no independent personality. They follow the trend of others, rely on others, and have no principles at all.

Original text of "Bat and Weasel":

The bat fell to the ground and was caught by the weasel. Just before he was about to be killed and eaten, he begged the weasel to let him go. The weasel said he could not let him go because he had always been the enemy of all birds. The bat said: "Oh, I am not a bird at all, just a mouse." The weasel said: "So you are a mouse, and now I can see you clearly." So the weasel let the bat go.

Soon, the bat was caught by another weasel in the same way. Just like before, he begged the weasel to let him go. "No," said the weasel, "I will never let go of any mouse."

"But I am not a mouse," said the bat, "I am a bird."

"Oh, so you are a bird," said the weasel, and let the bat go.