There are three types of cicada life cycle, the annual, periodical, and proto-periodical. After living as larvae, the annual cicadas have life cycles that vary from one to nine or more years, but they are not synchronized in emergence so some appear every year. The periodicals emerge in great hordes after 13 or 17 years, and in any given location they are synchronous. The proto-periodicals erupt in large numbers occasionally and are rare in all other years.
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