The cicadas have been living underground for 17 years, probably sucking sap from tree roots (or so I am told). They come out of little holes in the ground, crawl up a tree, and lose their old shell. After their wings expand and dry out, they are ready to mate, lay eggs, and be eaten. The must be quite tasty (at least my dog seems to think so).
See The University of Michigan Museum of Zoology's Periodical Cicada Page for more information.
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