Billions of cicadas are poised to emerge from their decades-long slumber this spring and early summer in a rare natural phenomenon not witnessed since the 1800s.

The double brood event will happen just south of Canada, with both 13-year and 17-year cicadas emerging simultaneously, which has not happened since 1803, when Thomas Jefferson was president of the United States.

“This is a big, big event” says David Beresford, a Canadian entomology professor.

Joe Scarpelli has more on this rare double brood and what is shaping up to be a raucous mating season.

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