They’re baaaaaack! Insect experts say that in mid-April through May, residents on the east coast will witness the emergence of billions upon billions of the singing insects called Cicadas. These odd bugs spend most of their lives underground and only make an above-ground appearance every 20 years or so--and only for a few weeks. Near the end of their lifespans they emerge to climb trees, shed their exoskeletons, sing, fly and mate. The next generation will emerge in 2030 to repeat the cycle all over again.