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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 clicking.