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Brood X cicadas are pictured June 10, 2021, in Danville, Illinois. The last time both the Brood XIII and Brood XIX cicadas surfaced from the ground at the same time was 221 years ago.
Brood X cicadas are pictured June 10, 2021, in Danville, Illinois. The last time both the Brood XIII and Brood XIX cicadas surfaced from the ground at the same time was 221 years ago.