Any day now the cicada population is expected to rise from their underground dwellings for the past 17-years and pay the earth's surface a visit.

According to io9, a conservative estimate by several experts puts the ratio of cicadas to humans in the region of North Carolina to Connecticut at 600 to 1. That means 30 billion cicadas to the area's 50.6-million people.

According to the Associated Press this year's invasion, Brood II, is expected to be one of the bigger ones. Several experts say that they really do not have a handle on how many cicadas are lurking underground but that 30 billion seems like a good estimate.

Unfortunately for humans the key to cicada survival is strength in numbers, "There will be some places where it's wall-to-wall cicadas," says University of Maryland entomologist Mike Raupp. One researcher estimates the cicada number to be 1 trillion.

Some scientists think the cicadas have these odd cycles so that predators cannot match the timing and wait for them in large numbers. Another theory is that the abnormal cycles ensure that different broods will not compete with each other.

In the past cicada invasions have seen as many as 1.5 million bugs per acre. However, most places along the East Coast will not be overwhelmed with the insect, and some places, especially in cities, may see zero, said Chris Simon of the University of Connecticut.

Places like Staten Island will get the brood of cicadas, but the rest of New York City and Long Island will not have to worry, Simon said. The cicadas also live beneath the metro areas of Philadelphia, Baltimore and Washington.

After a few weeks of buzzing around the cicadas will die and their offspring will go underground for another 17-years to return in 2030.