Why Do 17-Year Cicadas Appear Almost Every Year?

Some groups of cicadas spend 13 or even 17 years underground in between massive, noisy emergences. Learn about their life cycle and how cicada broods work in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/insects/why-17-year-cicadas-come-more-than-17-years.htm/printable

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