The discovery of a 22-million-year-old fossil panda has helped to solve the mystery of how pandas became vegetarian. The fossil, which was found in China, shows that pandas once had a much wider diet than they do today. They ate meat, fruit, and leaves. Over time, pandas gradually started to eat more and more leaves and less meat. This change in diet is thought to be due to the fact that pandas live in bamboo forests. Bamboo is a very tough plant, and it is difficult for animals to digest. Pandas have evolved special teeth and jaws that allow them to eat bamboo. Their teeth are shaped like molars, and they have a strong jaw that allows them to crush the bamboo.

The discovery of the 22-million-year-old fossil panda is significant because it provides evidence for the theory that pandas gradually became vegetarian. It also helps us to understand how pandas evolved to live in bamboo forests.