Best answer Cicada is a hemiptera insect, and there are 120 species in my country. As soon as summer comes, it will stand on the tree and call "Cicada-Cicada-Cicada" endlessly, and the sound will be heard far away. Cicada is an insect, also known as "cicada". There are many types of cicadas. Male cicadas have a sound generator on their abdomen, which can continuously make loud sounds. Although female cicadas also have a sound generator on their abdomen, they cannot make sounds. The larvae live in the soil and suck the roots of plants. After living underground for 4 years, they will emerge from the ground and become famous for a while. Adult beetles only suck the sap from plants. The life of a cicada goes through three different stages: egg, larvae and adult. The eggs are laid in the tree, the larvae live underground, and the adults return to the tree. After the cicadas mate, the male cicada completes his mission and dies soon after. The female cicada begins the task of laying eggs. It uses its pointed ovipositor to pierce small holes on the branches, and lays four to eight eggs at a time. Dozens of holes are often pierced on a branch, and then the female cicada The cicada refused to eat or drink and soon died. The eggs overwinter in the branches, and the larvae hatch out in the second summer with the help of sunlight. There are many types of cicadas in the world, with more than 3,000 species, and about 200 species are currently known in my country. In our country, the land is vast, and cicadas chirp all year round. In spring, there are "spring cicadas", which shout "Wake up - wake up" when they chirp; in summer, there are "summer cicadas", which shout "it's so hot - it's so hot" and "cicada - cicada"; In autumn, there are "autumn cicadas", which shout "I'm done - I'm done" when they chirp; in winter, there are "winter cicadas", which shout "It's over - it's over" when they chirp. Why do cicadas like to sing passionately and shout at the top of their lungs? The famous French entomologist Fabre was puzzled. He lived for more than 90 years, devoted his life's energy to the research of entomology, and wrote a collection of research papers of more than 1 million words - "Insect Diary". He has observed and studied cicadas for many years and made extremely vivid and detailed descriptions. He described the cicada's cry like this: "In the cavity behind the cicada's wings, there is a cymbal-like musical instrument. Not satisfied, it also needs to place a soundboard on its chest to enhance the intensity of the sound. , this kind of cicada has indeed made a lot of sacrifices in order to satisfy its hobby of music, because with such a huge soundboard, it has no place to place its vital organs, so it has to squeeze them into the smallest corner to place its musical instruments. And to shrink the internal organs, this is of course very enthusiastic about music." However, Fabre wanted to find out why the cicada kept pulling the "belly" cymbal and singing so enthusiastically, whether it was not there at all. When you hear your loud "voice", are you afraid that others haven't heard it like you, so you deliberately raise your "voice"? So, he conducted an experiment to verify whether male cicadas could hear sounds. He stood behind the male cicada, spoke loudly at a very close distance, blew the whistle hard, clapped his hands, hit stones with stones... and used various noises to scare the cicada. But the cicada continued to sing nonchalantly. He was really deaf to what was going on behind him, and he was only focused on singing. Later, Fabre simply found two muskets for hunting wild beasts, filled them with gunpowder, and fired them repeatedly next to the cicada. The sound was like thunder, but the "singers" still sang leisurely and contentedly, without even showing any fear or uneasiness. Neither. So Fabre came to the conclusion that the male cicada has no hearing. It can't hear any sounds around it, and it can't even hear its own hoarse scream. It is a complete "deaf". Is the male cicada deaf or not? This is the first mystery about cicadas. For more than 100 years, Fabre's conclusions have been widely accepted. Even until the 1980s, the part about cicadas in primary school Chinese textbooks still followed Fabre's view: cicadas are "deaf." However, more than 100 years ago, people always thought that male cicadas could hear sounds. And gave the male cicada the title of "music master". Even up to now, harps in the world are decorated with cicadas as symbols. There is also an allusion circulating here: According to legend, there were two famous music masters in ancient Greece, Aenomus and Aristo. On this day, two ancient artists were competing in a national harp championship competition in Athens.

When the female cicada flies close, the male cicada continuously emits a unique low-volume "wooing call" to attract the female cicada to come closer. At the same time, female cicadas can also make low-volume response sounds. Only in this way can the purpose of mating be achieved by mutual understanding. It's just that the low-volume infrasound of the female cicada cannot be heard by human ears. However, whether they are actually "talking" with low-volume sounds is a mystery. How does Ruo Chan keep time? This is Cicada's third mystery. After the male and female cicadas mate, the male cicada quickly ages and falls to the ground and dies, leaving the female behind. The female cicada uses its pointed ovipositor to pierce a circle of small holes on the twigs and lays the eggs inside the wood of the trees. She also uses her mouthparts to pierce a circle of bast at the lower end of the twigs to cut off the moisture in the branches. With the supply of nutrients, the young shoots gradually wither. In this way, the branches with eggs are easily blown to the ground by the wind, so that the hatched cicadas (called larvae) can burrow into the soil. The eggs laid by cicadas hatch into young cicadas in half a month. The life period of young cicadas is particularly long. The shortest one lives underground for 2 to 3 years, usually 4 to 5 years, and the longest is 17 years. Young cicadas live underground for a long time, with warm winters and cool summers, and few threats from natural enemies, so they are quite comfortable. After they molt 4 to 5 times, they will emerge from the ground, climb up the branches, and molt in sequence (called golden cicadas shed their shells) to become adults. What also puzzles entomologists is that cicadas can determine the time very accurately, complete the transition from larvae to adults in the "hell" at exactly the right time, and leave the "hell" at the right time to crawl out of the ground. This is an incredible miracle. Especially the 17-year-old cicada. This kind of cicada is neither more nor less, and it takes exactly 17 years of "hell" life to see the light of day. It will take another 17 years to see its children. Therefore, entomologists are always waiting for the appearance of the "17-year cicada" just like astronomers wait for solar eclipses and Halley's comet. How do young cicadas measure time in the dark underground, where they can see neither sunrise nor sunset, nor the harsh winter or heat? This is one of the great unsolved mysteries of science.