Beneath the soil of Victoria hides a giant worm that can reach three meters

Nature · Published 3 October 2026 Swipe more like this →

In short: The giant Gippsland earthworm is a subterranean marvel, reaching lengths of up to three meters. Unlike common garden worms, this elusive creature spends its entire life deep underground, rarely surfacing. Its presence is often betrayed only by the strange, audible gurgling sounds it makes while moving rapidly through its complex burrow systems.

The giant Gippsland earthworm, known scientifically as Megascolides australis, is one of approximately 1,000 native earthworm species found in Australia. Typically measuring one meter in length and two centimeters in diameter, these invertebrates possess a distinctive dark purple head and a blue-grey body composed of 300 to 400 segments. While their average weight is around 200 grams, exceptional specimens have been recorded reaching up to three meters long. Their biology is uniquely adapted to their environment, as they require constant moisture to respire, living exclusively in the deep subsoil of specific clay-rich stream banks and hillsides within the Gippsland region of Victoria.

Life for these worms is slow and secluded. They take five years to reach maturity and have a relatively long life expectancy for an invertebrate. During the warmer months, specifically from September to December, they reproduce by laying egg capsules in their burrows. These capsules, which measure between four and seven centimeters, incubate for a full year before hatching, at which point the young worms emerge at approximately 20 centimeters in length. Unlike surface-dwelling worms, they deposit their castings entirely within their deep, 52-centimeter-deep burrow systems, making them nearly impossible to find unless heavy rain forces them to the surface.

The species faces significant conservation challenges due to its small, isolated colonies and slow reproductive cycle. Their habitat is sensitive to human activity; while they can persist under pastures, they are threatened by heavy cattle grazing, soil cultivation, and effluent run-off. Furthermore, because they rely on specific soil humidity, dense tree planting can inadvertently destroy their environment. Despite their status as a local icon—celebrated annually at the Karmai Festival in Korumburra—efforts to breed the species in captivity have not yet succeeded. Their vulnerability is underscored by the fact that they remain confined to a very specific, shrinking range, making the preservation of their natural grassland and clay-soil habitat essential for their survival.

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