PITTSBURGH (AP) — With their bulging red eyes and deafening mating song, the 17-year cicadas are about to emerge.

The insects have been waiting underground for nearly two decades, and millions are about to make their debut around western Pennsylvania, parts of eastern Ohio and a small swath of West Virginia.

Penn State Extension horticulture educator Sandy Feather tells the Tribune Review it takes several days of temperatures above 60 degrees Fahrenheit for them to emerge. Temperatures around Pittsburgh are forecast to be in the high 60s and low 70s next week.

Feather says they’ll be loud, but they don’t pose a threat to anything except very young trees.

Adult cicadas don’t eat or bite and exist only to mate. They’ll all be dead by the end of June.

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Information from: Tribune-Review, http://triblive.com