By CBS3 Staff

PHILADELPHIA (CBS) — Get ready for a biological phenomenon! And a very loud one.

Massive swarms of cicadas are set to return to the East Coast this spring following a 17-year hibernation.

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They’ll start to appear in May, and chances are you’ll hear them.

Their courting and mating sounds can reach 100 decibels, which is as loud as a lawnmower.

They live up to four weeks, then their offspring go back underground for 17 years.

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