Illinois cicadas, loud but harmless, expected to make historic emergence in mid- to late May

In a restored savanna habitat behind the Lake Forest College science center, professor Sean Menke crouched down next to a small circular hole and stuck a thermometer into the ground. After a short wait, he took the device out to look at the temperature. “That was 52 (degrees), so that’s great.” The hole was, presumably, a periodical cicada’s tunnel dug ahead of this summer’s emergence of ...

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