The cicadas will be seen in at least a dozen states in a rare double-brood event.
For the first time in 221 years, more than a trillion of two particular periodical cicada broods are set to surface this spring. The last time this emergence happened was in 1803, when Thomas Jefferson was president and busy finalizing the Louisiana Purchase.
Brood XIII, emerging every 17 years, has its base in the northern half of Illinois and parts of Wisconsin, Ohio and Iowa. People are also reading… There are cicadas that surface annually, but periodical cicadas spend most of their lives underground. They unearth when soil temperatures hit 64 degrees to mate and lay eggs — marking the start of a new generation of that particular brood.
Cicadas molt, or shed their skin, four times during their life underground, so that may help them keep track of the years, he added.
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