Two broods of cicadas to cross paths again after 221 years
Various broods of cicadas typically hatch on 17 or 13-year cycles, and this year they're lining up. The two particular broods we're set to see haven't crossed paths like this in 221 years, meaning parts of Illinois are sure to get an extra buzz from the noisy insects.
Cicada Expert, Affilliate of the Illinois Natural History Survey at U of I Urbana-Champaign
US Forest Service