（4） The story of Crocodiles
Crocodiles have experienced hundreds of millions of years in the process of animal evolution, and have extraordinary abilities. Every summer, when animals like antelope and zebra migrate, it is also the time for crocodiles to show their own hands and enjoy their food.
Thousands of migrating animals, most of them herbivores, always follow the lush grass. And the crocodile at this time, already hungry. During the course of crossing the river, some herbivores fall into the belly of crocodiles. Crocodile is eating because it has no chewing function, so every time it eats, it rotates the body violently and quickly, tearing off large pieces of meat and swallowing it directly into the stomach.
In general, only 28 teeth are lost, one less because of tooth disease, caries, or old age. Finally, it was necessary to solve the problem by taping.
The crocodile has amazing functions, and it can replace more than 1000 teeth in its life. In animal world, only sharks can compete with crocodiles.
Sometimes, I would think, if human beings also have this function how good, even if it is a lifetime to change teeth also can, that will give us how much trouble! However, crocodiles have been trained in the course of hundreds of millions of years of evolution. And our human history is not as long as crocodiles. No wonder, we humans are not catching up with crocodiles in some ways. Crocodiles have evolved perfectly, but humans are still evolving.