Feeling “a little worried”, the woman inspected the large sacs, which were hanging near to a children’s trampoline in her garden.
But she still couldn’t tell what they were, so she turned to the internet for help.
The mum, from Sydney, Australia, shared images of the sacs on a northern beaches Facebook group, explaining that the pods appeared to have “spiderwebs around them”.
She wrote: “At the risk of looking like I have no idea (well I don’t), anyone know what these dangling things might be from the tree next door?
“Wondering if it’s something a little sinister.
“It’s hanging from next door’s tree close to our trampoline so (I) was a little worried!”
Thankfully, it wasn’t long before she had an answer – although it might not have been one she was hoping to receive.
People were happy to point out that the pods belonged to magnificent spiders, also known as bolas spiders, reports news.com.au.
Describing the species as “super cool”, one woman wrote: “When the eggs hatch, the baby spiders parachute down the little parachute webs.”
Magnificent spiders spend several nights building the sacs”, which contain around 600 eggs.
In late winter baby spiders emerge from the sacs then in early spring are swept away by the wind.
According to experts, they don’t pose any threat to humans – not that that was of much consolation to the worried mum who found them.
She said: “Oh god, all I can see are parachuting spiders gliding down onto the trampoline now!”
Helpfully, one Facebook user urged her to “leave the country now and don’t look back”.