Umm...

Nope.

They come up. Lay their eggs. Live for 24 hours. Drop dead. And get eaten.

The next generation does it in 17 years.

Oh...cause I thought I remembered cicadas chirpin their asses off when I was like 5...and then again when I was about 8 or something...whatever

Actually, it depends on the species:

"After mating, the female cuts slits into the bark of a twig and deposits her eggs there. She may do so repeatedly, until she has laid several hundred eggs. When the eggs hatch, the newborn nymphs drop to the ground, where they burrow and start another cycle. Most cicadas go through a life cycle that lasts from two to five years. Some species have much longer life cycles, e.g. the Magicicada goes through a 13- or even 17-year life cycle. These long life cycles are an adaptation to predation, as a predator could not regularly fall into synchrony with the cicadas. 13 and 17 are prime numbers, so while a cicada with a 15-year life cycle could be preyed upon by a predator with a 3- or 5-year life cycle, the 13- and 17-year cycles allow them to stop the predators falling into step."

http://en.wikipedia.org/wiki/Cicada

Silly owd me.