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For some, the long-awaited emergence of periodical cicadas — 13 years in the making — comes just in time for dinner.

For some, the long-awaited emergence of periodical cicadas — 13 years in the making — comes just in time for dinner.

The sight and sound of trillions of cicadas surfacing across much of America, a massive invasion of two separate groups called broods emerging at the same time, has scientists buzzing. For the first time in more than 200 years, two broods -- Brood XIX, known as the "Great Southern Brood," and Brood XIII, known as the "Northern Illinois Brood" -- will emerge from the ground simultaneously. While there is not extensive overlap between the two broods, some regions, especially in America's heartland

The sight and sound of trillions of cicadas surfacing across much of America, a massive invasion of two separate groups called broods emerging at the same time, has scientists buzzing. For the first time in more than 200 years, two broods -- Brood XIX, known as the "Great Southern Brood," and Brood XIII, known as the "Northern Illinois Brood" -- will emerge from the ground simultaneously. While there is not extensive overlap between the two broods, some regions, especially in America's heartland, will experience a double-whammy of cicada occupation, experts told ABC ...

For more than 99 percent of their lives, periodical cicadas hardly make a sound.