Cicadas expected to return with biggest swarm in 200 years

(CNN) — A rare event is coming, but this one you’ll have to look down for.

The cicadas are emerging soon! And there could be more of them than the world has seen in 200 years.
According to experts, some trillion cicadas will start appearing in may and live for about six weeks.

For the first time since 1803, two specific groups of cicadas will appear at the same time. The noise can be louder than a plane.
The cicadas will eventually die off and it will be another 221 years before the two groups appear together again.