Nymphs from the underground

In late May to early June 2007, in a region encompassing the top half of Illinois including Chicago, plus parts of Wisconsin, Iowa, and a bit of Indiana and Michigan in the US, the largest brood of cicadas in the world will emerge after spending the first seventeen years of their life underground. Known as Brood XIII, these 17-year periodical cicadas will emerge from the earth by the hundreds of thousands and even millions per acre.