In certain parts of North America, you can expect it every summer: the constant, droning buzz of cicadas. But if you hear it every summer, how is it possible that cicadas only come out every 13 years?
One Of These Broods Is Not Like The Other
How Do Cicadas Know When To Come Out?
They count. But how?
Key Facts In This Video
The mouths of cicadas are more like straws than jaws, made for sucking up plant juices. 00:48
The United States is home to 15 geographically distinct populations of cicadas. 01:26
In 2015, a 13-year brood and 17-year brood of cicadas both emerged. 04:04
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