Periodical cicadas are great at maths. They only ever emerge from the ground after a prime number of years (13 or 17). By doing this, different brood of cicadas minimise the chances of emerging at the same time, which could lead to hybridisation and extinction

submitted by /u/FrankenscienceNews [link] [comments]

source https://www.reddit.com/r/Entomology/comments/k85j5s/periodical_cicadas_are_great_at_maths_they_only/