The cicada is one of millions that emerged in the Great Lakes in June 2007. (Image: Scott Olson/Getty Images)
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Cicadas are known not only for traveling in large numbers, but also for their loud clicking and chirping noises, which can reach more than 90 decibels, according to magicicada.org. The ruckus is a key part of their mating ritual.
"Male cicadas produce their calls by rapidly vibrating a white, drumlike plate, or tymbal, located on either side of their abdomens," explains LiveScience.com.
When you consider the cicadas come out of the ground only to mate, lay eggs, then die, the urgency of the mating ritual makes sense. Time isn't on their side.
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So how soon until they come out? The Washington Post says the cicadas are poised to descend on the eastern United States as as soon ground temperature hits 64 degrees.
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Wild ponies are herded into the Assateague Channel to for their annual swim to Chincoteague Island, on July 25, 2012, in Chincoteague, Va. (Mark Wilson/Getty Images)