Cicadas are a type of insect that are known for their loud and distinctive singing, which is produced by males during mating season. Cicadas can be found all over the world, with different species found in different regions. However, the cicadas that receive the most attention are the periodical cicadas, which have a unique life cycle that takes place every 13 or 17 years.Periodical cicadas are found in the eastern United States and are divided into three main broods: Brood X, Brood XIII, and Brood XIV. Each brood has its own specific emergence schedule, with Brood X being the most well-known and widespread.Brood X is the largest and most widespread of the periodical cicadas and typically emerges every 17 years. The most recent emergence of Brood X occurred in the spring of 2021. This brood is distributed across 15 states, primarily in the eastern United States, including parts of Georgia, Illinois, Indiana, Kentucky, Maryland, Michigan, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and Washington D.C.The emergence of Brood X cicadas is a unique and spectacular event that is eagerly anticipated by scientists and cicada enthusiasts. The cicadas emerge from the ground, where they have been living as nymphs for the past 17 years, and climb up trees and bushes to sing and mate. After mating, the females lay their eggs in the branches of trees, and the cycle begins again.Cicadas are harmless to humans and do not cause damage to trees or plants. They are also a valuable food source for many animals, including birds, squirrels, and even humans in some parts of the world.In conclusion, cicadas can be found all over the world, but the most well-known and widely studied are the periodical cicadas found in the eastern United States. These cicadas have a unique life cycle that takes place every 13 or 17 years, with the most recent emergence of Brood X occurring in the spring of 2021. The emergence of cicadas is a unique and spectacular event that is eagerly anticipated by scientists and cicada enthusiasts, and is a reminder of the fascinating and complex natural cycles that take place all around us.