At the ebb of the tide, people can see a strange sight in the mangrove forest on the beach (mangrove forest is a kind of tropical and subtropical coastal shrub): there are many fish the size of loach, waving their tails and jumping around, even climbing onto the branches of mangrove trees! It preys on small insects, worms and other invertebrate animals here. The name of this strange fish is mudskipper, because it likes to eat shrimp best, and it is also called goby.

Mud-coated fish looks strange, generally 6 ~ 9 cm long, with dark brown body and some patterns or yellow spots. Its eyes are very interesting. Sometimes it protrudes from the eye socket, and sometimes it sticks into the eye socket, as if it can blink. What's even better is that its eyes can move in all directions, see all directions, find the enemy's situation as early as possible, avoid the enemy's harm, and ensure survival. Its pectoral fin is like a close-fitting big banana fan. The base of pectoral fin looks thick and strong, like a human arm, it can support the body to do various actions. The tail is like a blunt circular paper fan. The left and right ventral fins of mudskipper become sucker-shaped. All these special structures make the mudskippers crawl and jump on the beach, and even stick to the gates, steep walls or tree roots vertically, and live freely. Whenever they are frightened, they will jump into the water or get into the nearby mud at a very fast jumping speed in a triple jump.

mudskippers can not only move on mudflats, but also hunt land insects and crustaceans. Some of them are experts at swallowing and sucking shrimps and crabs. When they meet shrimps, they will eat them with their mouths open. When they meet bigger crabs, they will use their tails to lure sea crabs to take the bait, and then they will snap the crabs' claws hard, hold them, suck the broken claws and eat them beautifully.

The mudskipper can't live without water for a long time, but it has appendages similar to terrestrial animals and a structure adapted to land breathing. It can breathe with the help of dense capillaries on the skin and oral epidermis, and directly absorb oxygen in the air. What's more valuable is that its tail fin also has the function of assisting breathing, so the mudskipper can jump on the mud beach, come to land from time to time, or even climb trees, and people can beg for fish by the edge of the tree. Or at rest, the tail fin is often put into the water, which is the secret.