Similarly, periodical cicadas synchronously emerge in great numbers (more 370 per square meter) every 13th or 17th year.[1] This overwhelms predators and it's

Similarly, periodical cicadas synchronously emerge in great numbers (more 370 per square meter) every 13th or 17th year.[1] This overwhelms predators and it's thought that the prime-numbered intervals prevent predators from synchronizing their reproductive cycles with that of the cicadas. [1] https://en.wikipedia.org/wiki/Periodical_cicadas https://en.wikipedia.org/wiki/Periodical_cicadas