Periodical cicadas were in Virginia last year. What does that mean?

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Periodical cicadas were in Virginia last year. What does that mean?

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A. Although these cicadas take 17 years for their life cycle, different broods appear each year in the eastern United States. The 2004 brood is known as Brood X (Roman numeral “X” = ten). There are some twenty broods, and in the southern states, the broods take only 13 years to mature.

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