Wolf spiders beat a hasty retreat from their flooded burrows on NSW's mid-north coast. Screenshot / Melanie Williams, Facebook
In scenes most people would only experience in their nightmares, thousands of spiders have been caught on camera fleeing rising floodwaters across NSW in Australia.
A number of locals across the flooded state took to social media to share pictures of the phenomenon.
One of these was Melanie Williams, who almost lost her Macksville house to the swollen Nambucca River on NSW's mid-north coast.
Speaking to the ABC, Williams said she was watching the floodwaters make their way to her home when she spotted "all these little black things" running up her fence.
"As the water was rising, the letterbox was going under further and further and I could see all these little black things on there and I thought, 'Oh my God, they're spiders,'" she said.
"Then I looked at my neighbour's fence and almost had a heart attack. There were literally thousands of them."
The spiders, later identified as wolf spiders, were also photographed by Williams carrying their egg sacks to protect their babies.
Wolf spiders typically live in burrows underground, with the floodwaters forcing them out of their secret homes and into the open.
An hour south of Williams' Macksville home, more spiders were fleeing the flooded Kinchela Creek.
Kinchela, a village on the mid-north coast, sits near the Macleay River.
In a now-viral post on Facebook, Kinchela local Matt Lovenfosse shared the horrifying picture.
"All the brown you can see is spiders trying to beat the flood water," he wrote.
Despite the wild pictures, a professor from Sydney University's integrative ecology group said the flood of spiders wasn't a surprise.
Many areas across #NSW currently resemble an inland sea. Once the rain stops & the water begins to reside, there will be a massive combined effort to clean up. However until that happens, listen to warnings, follow the @NSWSES advice, look out for family, friends & neighbours. pic.twitter.com/vhDqxkw40E
"The urgency of getting out of the floods means these ground-dwelling animals have to move.
"Some spiders can survive underwater for a period of time but others can't and those ones are basically trying to move from the ground floor to the penthouse to avoid being flooded out."
NSW Premier Gladys Berejiklian earlier today revealed the devastating human cost of the flood crisis, saying many feel they are at "breaking point" as more than 18,000 people have been forced to flee their homes.