The image of cicada larvae first appeared on Shang bronzes in 2000 BC. From the late Zhou Dynasty to the funeral of the Han Dynasty, people always put a jade cicada in the mouth of the deceased for shelter and eternal life. Because people think cicada feeds on dew, it is also a symbol of purity.
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The growth process of cicada:
From June to July every year, pupae will become adults in just a few days, and then lay eggs. From the beginning of eggs to the process of nymphs living underground, until the last time they shell and become adults, they will make a scene in the trees. This period usually takes one to two years.
In cicadas, their larvae are also called "nymphs". Their male cicada will make sounds to attract the female cicada to mate with him. It lays eggs by inserting the oviposition tube at the top of it into the tree, incubating in the second year, and then living in the soil for several years or even longer before breaking out.
In the long life, they have to go through many times of shelling, and the first time after shelling, they will become an adult. When it becomes an adult, it will make a sound, and the sound made by the male cicada will constantly vibrate the two eardrums in the abdomen at a high frequency of hundreds of times per second, making a sharp and loud sound. This sound helps the female cicada locate the male cicada suitable for mating.