Love is in the air in the eastern United States, where billions of cicadas are appearing in the biggest emergence event since 2004.The insects are part of a group called Brood X — also known as the Great Eastern Brood — which is expected in a geographical range stretching from Tennessee to New York.These cicadas have been subterranean for 17 years, tunnelling and feeding beneath the soil. When they are back above ground, finding a mate will be, understandably, a top priority. The loud, buzzing drone cicadas make is actually a mating song emitted by male insects, flexing a drumlike organ called a tymbal.
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