America's second-largest cicada swarm is about to emerge across the East Coast

The low hum of summer typically includes lawnmowers and sizzling burgers - and this year, it may be the sound of cicadas. 

This year's brood of insects may be the second-biggest ever.

Two types of cicadas commonly exist in the Eastern United States: annual cicadas, which emerge every year, and periodical cicadas, which emerge every 13 or 17 years, according to the Environmental Protection Agency (EPA). The insects reside primarily in trees and shrubs.

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Broods are a way of categorizing cicadas based on this pattern, and less of a biological trait.

Because broods emerge in different areas, places that had cicadas last year may not have them this year, according to Dr. John R. Cooley, associate professor-in-residence of ecology and evolutionary biology at the University of Connecticut.

Brood XIV is referred to as a "keystone" brood, Cooley told Fox News Digital. 

It is the second-largest behind Brood XIX, the "Great Southern Brood," which last emerged in 2024 in 15 states from Oklahoma to Maryland.

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While there is another "Great Eastern Brood" - Brood X, which emerged in 2021 - Brood XIV is larger, and could thus be considered the "Great(er) Eastern Brood." 

Brood XIV will emerge in states ranging from Georgia all the way up to New York, according to the University of Connecticut.

"Once an emergence gets going, it lasts about a month, depending on the weather," Cooley said.

"It seems like the weather this year has been quite strange - the emergence is well underway in North Carolina, but further north, because of the cold weather, it hasn't even really started yet in Pennsylvania," he added.

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Adult cicadas climb into trees and shrubs to mate, and then females deposit their eggs onto small twigs. 

The babies, called nymphs, hatch from these eggs after six weeks and fall to the ground. They then burrow into the soil and begin feeding on the roots of trees and shrubs to restart the cicada lifecycle, according to the EPA.

Cicadas will not eat leaves, flowers, fruits or garden produce, so it is not necessary to take special precautions to cover or apply additional insecticides in your garden, the above source stated.

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"People should keep in mind that what they are seeing is unique - there is no other place in the world where such a thing happens, and they are found only in the U.S.," Cooley pointed out.

The EPA also notes that cicadas don't bite or sting, and they are not harmful to humans, pets, household gardens or crops.