The pectoral fins of the mudskipper are very developed, especially the chest muscles, which are not only developed but also have telescopic functions. Mudskippers use the support of their pectoral fins, coupled with the jumping power of their bodies and the driving force of their tail fins, to swim in the water and crawl on the beach. It can still live without water. Mudskippers always fully store oxygen in their gills before emerging from the water, and then come ashore in groups to hunt for food. Once the oxygen is used up, it sticks its tail into the soil to absorb oxygen. It can also use its skin or oral mucosa to breathe air. When there are trees on the shore, mudskippers will "climb" up the tree trunks to catch insects or small animals. Mudskippers are geniuses among fish. They spend much of their lives not in the water. The area where they live is covered with mangroves, and they are happy to climb up tree trunks or branches. They use their pelvic fins as suckers to grab onto trees and their pectoral fins to crawl upwards. Mudskippers have small pockets around their gills that can hold a breath of water, much like we can hold a breath. They climb trees so they can stay out of the water during high tide. "Looking for fish in trees" means looking for fish on trees. People like to use it to describe that if the method and direction are wrong, it will be impossible to achieve the goal. Because fish live in water, they breathe through gills. Once they leave the water, their gill filaments It will dry and stick together, and the fish will lose its life because it cannot breathe. "Fish cannot live without water" is basic common sense. However, if you go to the seaside in the South my country Sea and Southeast Asia, you will be surprised to find that it violates this basic principle. A common sense scenario is playing out here. You can actually find fish in the trees. When frightened, they can run into mud holes on the beach instead of just jumping into the sea and swimming away. This kind of fish can live on land. The fish is the mudskipper. In our impression, fish all live in the water, and even giant sharks are afraid of being stranded on the shore. What ability does the mudskipper have that makes it the first fish to reach land?