The cicada isCicadaeInsects, commonly known as cicadas. There are currently about 2000 species of cicadas with a body length of 2-5cm. With two pairs of membrane wings, prominent compound eyes, cicadas are male cicadas. The base of the male cicada's abdomensounderLike a big drum covered with a layer of eardrum, the eardrum vibrates and makes a sound. Because the cicada's singing muscle can expand and contract about 10,000 times per second, and the space between the cover plate and the tympanic membrane can play a resonant role, its singing is especially loud. However, female cicadas due to incomplete body structure, no tympanic membrane, and therefore can not sound, known as "dumb cicada". 

Cicadas are distributed in the tropics and live in deserts, grasslands and forests. The cicada has a hollow mouth like a needle that can pierce the tree and suck the sap. It is a larger insect that sucks plants. Before mating, cicadas will make courtship sounds. Eggs are laid in woody tissues. Nymphs enter the ground as soon as they hatch, inhabit the soil, and suck the sap from the roots of perennial plants. Generally, it takes several years to mature after 5 molts. When a black crack appears on the back of the cicada pupa, it begins to molt, and the whole process takes about 1 hour. 

The shells taken off by cicadas can be used as medicine,Traditional Chinese Medicinecalled"cicada clothing”、“cicada slough”， It is cool in nature, sweet and salty in taste, returns to the lung and liver longitude, can dissipate wind and heat, improve pharynx and open sound, penetrate rash, improve eyesight and retreat, rest wind and stop spasm, and is used to treat rubella pruritus,Mange. In ancient China, cicadas were endowed with the symbolic meaning of resurrection and eternal life. From the late Zhou Dynasty to the funerals of the Han Dynasty, people always put a jade cicada into the mouth of the dead in order to protect the dead and live forever. In ancient literature, cicada is considered to be a symbol of nobleness. In Western culture, the cicada is the image of the performer. Until now, the world'sHarpare decorated with cicadas and as a sign.