Cicada invasion begins as Brood XIV swarms parts of U.S. See photos.

This year, Brood XIV of cicadas is emerging after 17 years underground, primarily in Kentucky and Tennessee, with sightings expected in several other states. This one-in-17-year event will see cicadas surface in lower numbers compared to last year when multiple broods emerged. While cicadas are harmless to humans and pets, they play a crucial role in the ecosystem by aerating soil and serving as a food source for various predators.