Danilo Hegg on the decline of giant weta in Fiordland

New studies show Southern Alps giant weta are rapidly vanishing thanks to predators. Surveys in Fiordland have found declines of more than 90 percent, even in high-altitude sites thought to be out of the reach of rats or mice. The Weta Conservation Charitable Trust says there's an urgent need for targeted predator control to save the 'virtually defenseless' prehistoric insects. Trust chair Danilo Hegg spoke to John Campbell.