Starting this month, more than a trillion insects will dig themselves out of the ground like zombies. They’ll shed their outer shells and spread their wispy wings. After tunneling their way out of the dirt, these cicadas (sih-KAY-duhz) will cover trees, cling to grass, and blanket driveways.
Most species of cicadas emerge once a year. But this spring, two massive groups will arrive in the Midwest and Southeast. They’ve been underground since before fourth-graders were born. Brood XIX comes out once every 13 years. The cicadas in Brood XIII appear only once every 17 years.
It will be the first time in 221 years that the two groups emerge at the same time. Last time that happened, Thomas Jefferson was president!