Cicadas use prime numbers to outsmart hungry predators
These insects vanish underground for up to seventeen years, reappearing in billions to overwhelm birds and squirrels that cannot track such erratic, mathematical schedules.
Imagine a forest floor suddenly erupting with billions of buzzing insects that have been hiding in the dark for many years. Periodical cicadas spend thirteen or seventeen years underground as flightless juveniles called nymphs, sipping root sap before emerging all at once. By staying hidden for a prime number of years—cycles that cannot be divided into smaller, equal intervals—the insects ensure their life cycle rarely matches the population spikes of animals that eat them. If they emerged on a simpler schedule, any predator with a shorter life cycle would be waiting for a guaranteed feast every time its own numbers peaked.
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