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Can cicadas hear sounds?

No.

Male cicadas sing non-stop every day to lure female cicadas to mate. They cannot hear their "singing". Male cicadas of each species emit three different calls: a rally call, modulated by daily weather changes and the calls of other male cicadas; a courtship call before mating; and a harsh call when they are caught or startle and fly away.

The female cicada's musical instrument structure is incomplete and cannot produce sound, so it is a "dumb cicada". Some species are easier to identify based on their song, behavior, and morphology.

Extended information:

Life habits

Cicada larvae live in the soil and have a pair of strong digging front legs. It uses its piercing-sucking mouthparts to suck sap from plant roots, weakening the tree's vigor, causing branches to die, and affecting tree growth.

Usually they stay in the soil for several years or even more than ten years, such as 3 years, 5 years, and 17 years. These numbers have one thing in common, they are all prime numbers. This is because the factors of prime numbers are very few, which prevents it from drilling out with other cicadas to compete for territory and food.

At the end of June, the larvae begin to emerge into adults. The newly emerged cicadas are green and have a maximum lifespan of about 60 to 70 days. In late July, female adults begin to lay eggs, and early and mid-August are the peak egg-laying periods. Most eggs are laid on branch tips with a thickness of 4 to 5 mm.

It screams loudly in the trees in summer, and uses its needle mouthparts to suck out the sap. The larvae live in the soil and suck out the sap from the roots, which is harmful to the trees.

Baidu Encyclopedia - Cicada

Baidu Encyclopedia - Cicada