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Cicadas feed on sap from their roots. Cicadas usually suck sap from trees or other plants such as soybeans and corn through needles. And morning dew. In summer, trees bark loudly, so it is harmful for trees to suck tree juice with acupuncture mouthparts.
Cicada is a representative species of cicada. The male's abdomen has a sound generator, which can constantly make sharp sounds. The female doesn't make a sound, but she has a hearing device in her abdomen. Larvae live in the soil, suck the roots of plants, and adults eat the juice of plants. Cicada is an incomplete metamorphosis. Without pupa, it changes from egg and larva (nymph) to adult after molting once. The same "Zen" comes from Buddhism.
In a word, cicadas are pests and harm trees, so it is not recommended to breed them.