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Billions of insects will swarm USA after hiding underground for 17 years next month
BILLIONS of insects are set to swarm on the US next month after spending 17-years underground.
The cicadas are expected to emerge in dozens of states including New York and Georgia.
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According to , insect experts are highly anticipating the event as they have to wait just under two decades to see one.
The group of cicadas expected to appear in April is called Brood X.
The huge swarm of insects will create a loud buzzing symphony as their mating ritual occurs for around four weeks.
After mating, the female cicadas lay small eggs in tree branches and then all the adult cicadas die.
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Once the eggs hatch, the tiny cicada nymphs will fall to ground and burrow down.
They'll then stay underground and grow larger for another 17 years.
However, some species only stay underground for 13 years.
There are thought to be 3,000 to 4,000 species of cicadas in the world.
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The ones in the eastern parts of the US are well-known for their lengthy juvenile periods and mass adult mating events.
No one is quite sure why the insects spend so long underground.
They go through five growing phases and feed off tree roots.
When big enough, they crawl from the ground and up trees so they can shed their skins and grow wings for flying to potential mates.
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They're known as periodical cicadas because their synchronised emergence has been predictable for years.
North of the Mississippi Valley they generally appear every 17 years and in the South they appear every 13.
Experts think cicadas emerge in large numbers for safety reasons as they're not good at protecting themselves.
Big swarms lead to more insects finding a mate.
They have lots of predators including foxes and birds but there's usually too many cicadas to be eaten.
Some cicadas groups have been known to emerge a few years early or late and researchers are looking into whether climate change will have an impact on their cycles.
Cicadas are sensitive to climate and need deciduous forests to survive.
Deforestation poses a big threat to the species.
Local volunteers who live near cicadas broods in the US are being encoruaged by researchers to download the .
It allows people to enter information about the cicadas they see and help with scientific research.
Cicadas are not harmful to humans.
Deadly animal sex facts
Here's some shocking facts you probably didn't know about animals who die for desire...
If female ferrets don't have sex they will die of aplastic anaemia unless medical intervention occurs
Some female spiders eat male spiders after they have finished mating with them because they want to use them as a form of nutrition to feed their offspring
Drone bees exist purely to have sex with the queen of their hive and then they die afterwards
Female Pacific salmon die almost immediately after mating while the male salmon survive a little bit longer to protect the eggs
More than 1.5 MILLION cicadas ‘to emerge after decades underground and head to the skies’
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