Trillions of evolution's bizarro wonders – red-eyed periodical cicadas that have pumps in their heads and jet-like muscles in their rears – are about to emerge in numbers not seen in decades and possibly centuries.Crawling out from underground every 13 or 17 years, with a collective song as loud as jet engines, the periodical cicadas are nature's kings of the calendar.These black bugs with bulging eyes differ from their greener-tinged cousins that come out annually.
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