Billions of cicadas are expected to surface this spring as two different broods - one that appears every 13 years, and another every 17 years - emerge simultaneously.
Here's what you need to know going into cicada season.This spring's bugs are part of a genus, or group, of cicadas in the eastern US known as the Magicicada, or periodical cicadas.
"17 and 13 doesn't overlap too often," said Frank Krell, Ph.D. entomologist at the Denver Museum of Nature and Science. It's easy to tell annual and periodical cicadas apart. Annuals tend to emerge later in the year than periodicals. For instance, the "dog day" annual cicadas in the genus Neotibicen tend to show up in the dog days of summer, around August, whereas the periodicals make their appearance in the spring. While there are numerous species of annual cicadas, many of them are large and greenish.
There are some areas of central Illinois where the two broods' geographic ranges have historically been close to each other and could potentially overlap. However, predictions of a cicadapocalypse - in which Brood XIII and Brood XIX show up at the same place at the same time - are probably an exaggeration.
"You should expect lots and lots of cicada exoskeletons to be covering your trees and shrubs. You should expect to hear lots and lots of noise," Larson said. The insects are likeliest to be in wooded areas near water, he added.
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