Three species of cicada that only emerge once every 17 years are gearing up to spring to the surface in droves.

Cicada Safari users have seen Brood XIX in states ... in the U.S. The only type that used to exist was the Rocky Mountain locust, which became extinct in 1902. There is a locust species in Mexico ...

Brood XIV cicadas are gearing up for their debut later this spring. This brood periodically emerges every 17 years.