It is said that crocodiles appeared before dinosaurs. When there is no shade on the earth, the desert can't see the end. However, there is also some dirty soil in the desert. It is said that there is a stone in the dirty mud, and some people say it is a fish egg on the stone. This fish egg sticks to the stone, very, very small, as transparent as it is. But if you soak in water for a long time, you will produce creatures. When crocodiles are bigger than mud, mud can't stop the sun. Crocodiles build tunnels to the underground by digging holes. The lower layer of the desert is very humid, which can block out the sun. It is said that when dinosaurs appeared, forests had already formed in some places. The forest at that time was never seen before, and it was completely different from the forest now. Dinosaurs were very careful when drinking water to avoid being killed by crocodiles. Some crocodiles eat dinosaurs. They hide themselves through muddy water. In addition, their skin also has advantages. Their skin is all gray, brown and black, which can be used for camouflage. It is said that when dinosaurs died out, crocodiles were very small and escaped by hiding in the deep sea. However, some crocodiles died, but a small number of crocodiles survived, while dinosaurs were large and had no hiding place, and were hit by meteors or meteorites on the surface of the earth, forming a large-scale fire. Dinosaurs were burned alive and crocodiles hid in the deep sea. In this way, crocodiles were handed down from generation to generation, but dinosaurs were forgotten by the times. It is said that the fire lasted for a long time, completely destroyed the earth and most of the tropical rain forest, and the world started again. The only constant is that the crocodile survived.