Billions of cicadas are set to appear in a rare 'double brood emergence'

Billions of cicadas are expected to surface this spring as two different broods — one that appears every 13 years, and another every 17 years — emerge simultaneously. The 13-year group, known as Brood XIX, or the Great Southern Brood, is the largest periodical cicada brood, stretching across the southeastern United States. The Northern Illinois Brood, or Brood XIII, emerges every 17 years.

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