This year's batch last appeared in 2003.
According to researchers, periodical cicadas are unique in that "all (or nearly all) members of the population emerge in one year and then are absent in the intervening years."
The cicadas typically begin to emerge from the soil between mid-May and late June after warm weather and rain.
Experts said the brood emerging this year includes all three 17-year species: Magicicada septendecim, Magicicada cassini and Magicicada septendecula.
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