RIDDLE - Learning a good
A heron caught a fish in his bill and was carrying it alive back to his nest. Worried about his own life, the fish was thinking hard to find a way to free himself. Coming up with a bright idea, he then said to the heron,
The heron thought it was a sure win because even if he couldn't find the answer, he'd just simply say something wrong. Either way the fish would die. So he agreed immediately.
The fish then asked a simple question. The heron then realized that he would lose for sure. So he had to drop the smart fish back to the waters, having learned a good lesson.
What was the question that saved the fish's life?