Cicadas: When are they the loudest?

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CHICAGO (WGN-TV) — They've begun to emerge. And they're going to make their presence very much known.In Illinois, two broods of periodical cicadas are coming out. In central and southern Illinois, its the 13-year cicadas. In central and northern parts of the state, it’s the 17-year cicadas. (More on what this means is down below). Together, it means billions of them will be making that signature buzzing and c