The ancients believed that cicadas were noble and pure. In Historical Records, Biographies of Qu Yuan and Biographies of Jia Sheng, they said: "Cicadas shed their filth and get rid of floating dust." Cicada lived in muddy water until it finally shed its shell and became an adult. When it takes off its shell and becomes a cicada, it flies to a big tree and drinks only dew, which is an undyed sludge, so it is highly praised by the ancients. At the same time, cicadas can live underground and emerge. Since the Han Dynasty, the appearance of cicada has been used as a metaphor for the rebirth of human beings. If you put the jade cicada in the mouth of the deceased, it is called "cicada-shaped jade" in idioms, which means that the soul will never die and be reborn. And wearing cicadas means nobility.
Animal Description: Cicada, also known as cicada, cicada, cicada, cicada and tortoise, is a medium and large insect in Cicadaceae, with about 2,000 species. It is 2 ~ 5 cm (0.8 ~ 2 inches) long, with two pairs of membranous wings, prominent compound eyes and 3 monocular eyes. There are two species of Cicadellidae, commonly known as Cicadellidae, which are only distributed in southern Australia.
Reproduction: Cicada's eggs are usually laid in woody tissues. Once hatched, the nymph burrows into the ground and sucks juice from the roots of perennial plants. Generally, after molting for 5 times, it takes several years to mature. When the number of female insects is large, the oviposition behavior will damage the young trees.
Distribution: Cicadas are mostly distributed in tropical areas, inhabiting deserts, grasslands and forests. In addition to the species of Lepidoptera, there are periodic cicadas, which appear in midsummer every year. The most famous periodic cicadas are 17 cicada and 13 cicada, which appear in a certain area at regular intervals. Some species are easy to distinguish in singing, behavior and morphology. Male cicadas of each species make three different songs: collective songs, which are regulated by daily weather changes and other male cicadas; Courtship before mating; The harsh sound made when caught or afraid to fly away. Larvae live in the soil and suck the juice from the roots of plants, while adults suck the juice from the upper parts of plants.