2011 Middle Tennessee Cicada emergence. Noise level is a stunning 98 dB peak as displayed on the sound level meter. Prolonged exposure at anything over 90 dB can cause hearing damage. Rock concerts, trains, heavy traffic inhabit this realm of noise. Fortunately, these critters aren't around long -- 6 weeks in May and June and only every 13 years. Cicada's mate and die, eggs hatch, fall and live underground for 13 years then emerge to repeat the same cycle.
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