Spiders Rain Down on Australian Town

May 20, 2015 5 comments

While raining cats and dogs is only a metaphor, raining spiders is a reality in Australia. The latest arachnid shower took place last week in a town called Goulburn, in New South Wales, approximately 195 km south-west of Sydney, where millions of tiny spiders rained down from the sky and blanketed the countryside with their webs. Unlike the rare frog rains and fish rains, that’s not entirely understood, arachnid showers is a well documented phenomenon called “ballooning” which is used by spiders and some other invertebrates to migrate from one pace to another.

During a “ballooning” event, the spiders will climb up as high as they can, stand on raised legs with its abdomen pointed upwards and release several silk threads into the air. These strands form triangular shaped parachutes that allow them to be carried away by the wind hundreds of miles to a new territory. In windless conditions, the Earth's static electric field may also provide lift.


Spider webs cover the ground in the Australian town of Goulburn. Photo credit: Daniel Munoz / Reuters

The vast majority of these spiders die during the journey, eaten by predators or killed by harsh weather conditions. But a small fraction survive to set up a new colony. Once they land, the spiders disappear into the ground and the threads, made of protein, disintegrate until there is no evidence that anything has happened.

According to Robb Bennett, a research associate in entomology at the Royal British Columbia Museum in Victoria, it's unclear what spurs these ballooning events, though it’s sometimes associated with heavy rainfall. The astonishing spectacle usually occurs in May or August in Australia, right after rainfall. It is rare because it requires an unusual weather pattern for this time of year, which is when spiders are hatching.

Such ballooning events, however, aren't unique to Australia. They also occur in the Northern Hemisphere where ballooning spiders have been spotted in the United States and Britain.

Also see: Trees Cocooned in Spider Webs After Pakistan Flood


Photo credit: Daniel Munoz / Reuters


Photo credit: Daniel Munoz / Reuters


Photo credit: Daniel Munoz / Reuters


Photo credit: Daniel Munoz / Reuters

Sources: National Geographic / News.com.au / Wikipedia


  1. Hey look - I found one of my 7 circles of hell! - not visiting that place anytime soon!

  2. ^^ TOTALLY agree…yuck..^^

  3. raining cats and dogs is not a metaphor. it goes back to the middle age. there was no propper sewerage.
    so when there was a lot of rain the streets were full of drowned animals mostly cats and dogs.

  4. Yeah! So disgusting... I always wondered how Australians could live with all kind of spiders, snakes and so..

    1. As an Aussie I can say we don't have much of a problem with snakes even though we have the most dangerous in the world. Spiders yeah but that's fine. I once walked into one of those webs and baby spiders ran everywhere. Can't say I like that one much. There are more problems from humans to worry about.


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