> Which insect emerges from underground once every 13 or 17 years?And the answer: cicada.There are more than 3,000 species of cicadas around the world. Most make anappearance every year, with males buzzing loudly from trees. However, in easternNorth America, there are also cicadas that appear only once every 13 or 17years.Brood X (Brood 10), the Great Eastern Brood, is one of 15 broods of periodicalcicadas that appear regularly throughout the eastern United States. It has thegreatest range and concentration of any of the 17-year cicadas. Every 17 years,Brood X cicadas tunnel to the surface, lay eggs, and die off in several weeks.Their very brief above-ground period combined with such a lengthy dormancy makeshunting these insects a challenge -- no specialized predators can truly adapt tosuch a highly absent species.There is also evidence to suggest that their prime number cycle helps protectthe species and allows them to successfully repopulate. The theory argues thathaving a prime numbered life cycle keeps them out of sync with the life cycle ofpredators, which prevents any particular kind of predator from being toodependent on the cicadas for food. In other words, predators with one, two,four, or even eight-year life cycles won’t get too used to catching cicadas thatshow up only once every 13 or 17 years.The next Brood X year on the calendar is 2021. Visit this site[https://www.cicadamania.com/cicadas/category/broods/brood-x/]to see the cicadahotspot closest to you.