The empty shell of a periodical cicada nymph clings to a tree after the adult insect molted on May 10, 2021 in Takoma Park, Maryland. Once soil temperatures reach about 64°F, billions and billions of these periodical cicadas – members of Brood X – will emerge in fifteen states and the District of Columbia after living underground for 17 years. The cicadas will emerge, molt, mate, lay eggs and die within a matter of weeks. (Photo by Chip Somodevilla/Getty Images)
