Cicadas live underground as nymphs for most of their lives, at depths ranging from about 1 ft to 8.5 ft down. The nymphs feed on root juice and have strong front legs for digging. In the final stage, they construct an exit tunnel to the surface and emerge. They then molt (shed their skins) on a nearby plant for the last time and emerge as adults. The abandoned exoskeleton remains, still clinging to the bark of trees.