Cicada invasion: Trillions of noisy flying insects to swarm US for first time in 221 years

Billions, if not trillions, of two groups of noisy flying insects are expected to emerge from the underground in 17 U.S. states in April in a rare natural phenomenon not seen since 1803.

The insects, known as cicadas, are set to spring up and engage in a frantic mating frenzy lasting several weeks before they will all eventually die near trees.

But that’s not before they lay eggs on forest floors and the cycle of life begins anew.

RARE BROODS OF CICADAS TO ARRIVE SOON: WHEN TO EXPECT THEM AND WHAT IT MEANS FOR YOU

It will be the first time in 221 years that two types of cicadas -- brood XIX and XIII--  have risen from the grou...