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Why Do Some Cicadas Appear Only Every 17 Years?
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Periodical cicada (genus Magicicada)
Why do some cicadas appear every 17 years?
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Why Do Some Cicadas Appear Only Every 17 Years?: Media

Every 17 years a swarm of cicadas appears in the northeastern United States. Why?
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Why do some cicadas appear every 17 years?
And how much buzzing will you hear this summer?
Video: Encyclopædia Britannica, Inc.

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Periodical cicada (genus Magicicada)
© Ed Reschke-Stone/Getty Images