A prehistoric giant wētā survived on a single island for centuries

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: The Little Barrier giant wētā is one of the world's heaviest insects, a flightless relic that once roamed New Zealand's mainland. Now restricted to a tiny island, this nocturnal nomad faces an uphill battle against invasive predators while undergoing a high-stakes rescue by conservationists.

Deinacrida heteracantha, or wētāpunga, is the largest of its species and a striking example of sexual dimorphism. While adult males average just 7.4 g, females can reach an average weight of 32 g, with gravid individuals weighing up to 70 g (2.5 oz). These wingless insects are primarily herbivorous, feeding on forest foliage at night. They lead a nomadic, solitary existence, moving periodically through habitats ranging from second-growth forests to tall kauri forests.

The species' history is marked by dramatic decline. Once found in the warmer parts of New Zealand's North Island, they were declared extinct there during the 19th century. By the 1950s, they were common only on Hauturu (Little Barrier Island), an area of just 3,083 hectares. Their survival was threatened by feral cats and Polynesian rats (kiore). Notably, after kiore were removed in 2004, the wētāpunga population saw a four-fold increase within six years.

Conservation efforts are now focused on creating self-sustaining populations on predator-free islands. Since 2008, the Department of Conservation has managed a captive breeding program at Butterfly Creek and Auckland Zoo. These programs have successfully released thousands of individuals onto islands like Motuora and Tiritiri Matangi. This initiative is critical because the species remains classified as vulnerable due to its restricted distribution and ongoing population declines.

Biologically, D. Unlike any other members of its genus, heteracantha possesses an additional instar. A prolonged nymphal duration and increased total body mass result from this extra growth phase. Despite lacking courtship rituals or stridulatory signals for mating—relying on contact alone—they possess complex stridulatory organs used for interspecific defense, producing sounds with major peaks at 20 kHz and minor peaks around 40–50 kHz.

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