Why does the cat wag its tail?

The cat's tail acts as a balance, especially when jumping at high altitude.

There have been studies in this field abroad. A cat fell from the sky, and its landing process was photographed by a high-speed camera. It is found that the posture of the cat in the air is constantly changing, and the secret of this change is that the cat's tail swings, which plays a role in mastering the balance, so no matter how it falls, the cat can finally land safely.