Shrimp drum makes a "click-click" sound through the opening and closing of pliers. It also shoots water with pliers to drive away the invading enemy. You can also use this to stun the small fish in front of the shrimp tongs.

Shrimp belongs to Arthropoda, Crustacea, Decapoda, Shrimp Family and Shrimp genus.

The body length of drum shrimp is generally 35-55 mm. The back of the body is brown or marginal brown. The frontal angle is slender and long, extending to the end of the 1 frontal stalk 1 segment. The posterior ridge of frontal angle is not obvious. The big pincers are long, which is four times as long as the width. The length of the palm is about twice the length of the finger, and the inner and outer edges of the palm have 1 extremely deep notch behind the base of the movable finger, and the dorsal and ventral surfaces of the outer edges have 1 short thorn. Small pincers are slender, equal to or longer than large pincers, and the dorsal and ventral surfaces near the base of movable fingers at the outer edge of the palm also have 1 thorn. There is no longitudinal groove on the back of the caudal segment, but there are two pairs of strong movable spines. Habitat in the muddy shallow sea area. China's coastal areas are equally productive.

There are four kinds of drum shrimp: bright drum shrimp, Japanese drum shrimp, short-ridged drum shrimp and spiny drum shrimp. Drum shrimp is generally 3 ~ 6 cm long, round and thick, and its head and breastplate are smooth and spineless. The eyes are completely covered by the head and breastplate. The first pair of feet are particularly strong, pincer-shaped, and asymmetrical, and the male is stronger than the female. When living, there are many obvious patterns on the body, especially the bright drum shrimp, which is bright and beautiful. The breeding season of drum shrimp is in autumn, and the eggs are held between the female abdominal limbs until they hatch. Drum shrimp is called drum shrimp because it opens and closes the finger of the big claw when it encounters the enemy and makes a sound like a small drum.

This kind of shrimp is holding this big pliers to feed in the shallow water of tropical ocean, ready to grab a good meal at any time. When this big pliers is disturbed at lightning speed, it will make a crunchy sound. If there are enough shrimps in the shrimp group, the whole sound sounds like dry wood burning, making and cracking. Trev Lozer, a physicist at the University of Twente in the Netherlands, said: "The sounds made by the huge shrimps are enough to interfere with underwater communication. Some submarines often use the bulging shrimps off the coast of the United States to hide and use the sounds made by the shrimps to escape sonar search.

Just like many castanets are beating, the shrimp in the ocean will make a constant sound. But why can such a small creature make such a loud noise? Scientists have long wanted to solve this mystery. Now a team of scientists in Europe has finally found the answer: these shrimps will make some blisters underwater, and when the blisters burst, they will produce a strong current that can kill their tiny prey.

The research shows that when the shrimp quickly closes the pliers, there will be a high-speed water flow with the speed of 1 12 km per hour. This water flow makes the water pressure drop sharply in a short time, forming a bubble in an instant. The diameter of the bubble will reach about 4 mm. As the pressure returns to normal, the bubble will burst immediately, and the sound will be made when the bubble bursts. The whole process takes about 600 milliseconds.

The drum shrimp on the bottom of the sea that makes ultrasonic waves is violently closed by the shrimp tongs, which generates ultrasonic waves. The heat generated at the closing point can reach the temperature of the sun surface, and this energy is enough to stun the small fish in front of the shrimp tongs. At the bottom of the sea, the main interference of submarine sonar system comes from this shrimp drum.

The revolver is modeled after its pliers.

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