You lay in bed, the nights hot and humid and then there is that extremely noisy buzzing sound that just adds to your summers night pain. Unlike Crickets they don't make their racket by rubbing external body parts these guys make it internally and do it well. 120dB is not unusual apparently. I have been known to rush outside on a hot night and shake the trees close to our bedroom to make the little bu**ers fly off.
The males are the ones that we hear. Cicadas live 30cm to 2.5m below the ground as nymphs for 2 to 5 years and then emerge, shed their shells (see post pic below) and start life.
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