After 17 years, cicadas are back

A BUG'S LIFE: After living underground for 17 years, billions of red-eyed insects are emerging from the earth for a few brief weeks of life above ground, as part of a bizarre survival strategy.
1:30 | 05/18/21

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Transcript for After 17 years, cicadas are back
A. OK a. Okay. Yeah. Why so many cicadas cicadas have one of the most bizarre strategy. Survival of any creature of it's called predators they instigation. They're going to emergency action massive numbers synchronous Lee they'll build the Valium every credited that wants to eat them. And they'll still be enough left over here. Perpetuate their speed.

This transcript has been automatically generated and may not be 100% accurate.

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