When you look in a mirror, you see yourself. You know it's you. Do fish know themselves? Knowing themselves means fish are smart. Scientists wanted to find out. So they gave some fish the mirror test.

照鏡子的時候，你知道鏡子裡的人是自己，魚可以認出鏡子裡的自己嗎？認的出，就代表魚很聰明，所以科學家做了實驗。

Click HERE for the full transcript!