1, cicada, also known as cicada, only sucks the juice from branches all its life. It uses needle-like mouthparts to suck the juice (sap) of food trees. Whenever the cicada is thirsty and hungry, it always sticks its hard mouthparts into the trunk to suck the juice all day, and sucks a lot of nutrients and water into its body to prolong its life.

Cicada grows in the soil before it is mature, and then slowly digs a hole and climbs up the trunk. If there is mud in the soil-stealing hole, there will be cicadas. Cicada lies on the tree trunk at night to shed its shell, and then it has wings.

Cicada larvae live in the soil and have a pair of powerful digging front legs. Sucking the sap from the roots of plants with mouthparts weakens the tree, makes the branches die and affects the growth of trees.

3, usually stay in the soil for several years or even more than ten years, such as three years, five years, there will be 17 years. These numbers have one thing in common, they are all prime numbers. This is because there are few prime factors, which can prevent them from drilling out with other cicadas when they drill out of the soil, competing for territory and food.

4. When it is about to emerge, drill out of the ground at dusk and night, climb to the tree, and then grab the bark to shed its skin and emerge. When a black crack appears on the back of the cicada pupa, the molting process begins. The head came out first, and then the green body and wrinkled wings were revealed. Stop for a minute with hardened wings and deepened colors, and start to take off. The whole process takes about an hour.