Every 17 years, the cicadas return to the north east united states. In the next few weeks it is estimated their will be ~1 billion cicadas per square mile.
http://news.yahoo.com/blogs/sideshow/cicadas-coming-151907579.html“In places where they’re going to be present, it’s going to be spectacular. There could be as many as 1 billion cicadas emerging per square mile,” Michael Raupp, a professor of entomology at the University of Maryland, told 1010 WINS. Translation: Ick!
Cicadas spend most of their lives underground. Near the end of their lifespans they emerge to climb trees, shed their exoskeletons, sing, fly and mate. Both females and males die soon after the females lay their eggs. The next generation will emerge in 2030 to repeat the cycle all over again.
Aside from the mess and the loud mating calls, these swarms of critters are harmless. But their homecoming in the last stage of their lives is unforgettable to those who experience it thanks, in part, to how they serenade whole neighborhoods with their loud chorus of chirping.
"Most people say it is like a science-fiction movie UFO sound,” cicada researcher Dan Mozgai wrote to Yahoo News in an email.