Periodical cicadas have a very strange lifecycle.

They spend 13 or 17 years underground (depending on the brood), and then suddenly emerge in their billions over the course of a few weeks.

And now, in 2024, an ultra rare "dual emergence" of cicadas is happening – with two different broods of emerging at the same time. It has not happened for 221 years – and won't happen again for another 221 years.

Cicada expert Dr Gene Kritsky explains it all.

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