Billions of cicadas will soon crawl out of the ground in 15 Midwestern and East Coast states, kicking off the adult chapter of their life cycle. Spring of 2021 marks the emergence of “Brood X,” three species of “periodical” cicadas that surface once every 17 years. People who live farther south can expect to witness the proliferation of the red-eyed cicadas starting in early May, whereas residents of northern states may have to wait a few weeks. You may already be able to spot the holes where ci