Cicada invasion

So...late summer we get these Cicadas. A seemingly harmless, beetle-like bug. I hear they bite. All I know is that this beetle thing climbs out of the ground (they hibernate there for up to 17 years for some species) and they shed their shell (photo one) leaving it on the tree. Then they unfurl their wings and are bright green right after shedding but quickly turn a dark brown. They are quite large and make this constant buzzing sound during the day. We had quite the infestation of them this summer and Alex was most intrigued by them.