Billions of cicadas will emerge this spring across eastern and southern states as two broods arrive simultaneously for the first time in more than 200 years.
, spend most of their life underground in an immature nymph form before surfacing from the ground every 13 or 17 years for a brief adult life. A brood constitutes multiple species of cicadas that merge on the same cycle., professor emeritus of biology at Mount St. Joseph University and author ofBrood X Cicadas Are Busy And So Are The Scientists Who Study Them
Brood XIX, known as the Great Southern Brood, contains four species of cicadas and emerges only every 13 years. The Northern Illinois Brood, or Brood XIII, is on a 17-year cycle and contains three species of cicadas. Once the ground reaches the optimal temperature of 64 degrees Fahrenheit, the insects find their way to nearby trees and shed their skins, Kritsky said. It takes about four to five days for the adult males to start singing, but once they do, their songs can be louder than a jet engine.
While the two broods this spring will mostly be separated by time and place,"they will overlap for several weeks," in Illinois, says Shockley. This overlap could result in some Illinois residents hearing all seven species of the two broods singing their cacophonous mating calls together, he says.
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