Parts of US will see cicada outbreak this summer, experts say

One of the millions of periodical cicadas in the area clings to a leaf on Saturday, June 1, 2019 after it emerged from a 17-year hibernation in Zelienople, Pa. The insects come out of the ground once the temperature reaches optimum, then climb into trees and make a droning sound to attract mates to breed. Their activity will peak between mid-May and mid-June, and then die off about four weeks after first emerging according to the Department of Agriculture web page. (AP Photo/Keith Srakocic)