
07/29/2025
This phenomenon is the result of a natural event known as “ballooning” or mass spider migration, which frequently occurs in southeastern Australia, particularly in Victoria and New South Wales, after heavy rains and floods.
During this time, thousands or even millions of ground-dwelling spiders release silk threads to catch the wind and escape rising floodwaters.
These threads can coat entire landscapes — fields, fences, trees, and even power lines — creating what looks like a vast white sheet.
This isn't an everyday sight, but it has been documented multiple times, notably in 2012, 2015, and most recently in June 2021 in Gippsland, Victoria, following significant flooding.
The spiders involved are typically harmless sheet-web weavers or money spiders, which do this ballooning behavior to disperse and survive environmental changes.
Although it may look alarming, experts confirm it's a temporary and harmless natural event, and not an “infestation” in the dangerous sense.
Australia’s unique ecosystem and extreme weather patterns make such biological spectacles more common there than in most parts of the world.