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17 Year Cicada: 17 Year Cicada Locations - But the biggest puzzle to biologists is the significance of cicadas extended life cycles.
There exist 6 species of periodical cicadas: with a 17-year cycle (3) and with a 13-year cycle (3). But all those three species of each life-cycle group differ in size, color, and sound. The 17-year-old cicadas tend to locate in the North, while the 13-year-old ones - in the South. Nevertheless, both types may emerge in the same forest.
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