Periodical cicadas, also known as 17-year locusts, will emerge from the ground this summer across the state. These cicadas are the offspring of the adults from 1997. These Brood III periodical cicadas, known for their buzzing or singing, are usually found in upland native woodlands. The lifespan of these creatures is one of the longest for insects. Also, populations can reach up to 1.5 million cicadas per acre.