Man's Heritage: In Search Of The Moa Pearl, 8.30pm This one-hour documentary about New Zealand's moa aims to unravel the secrets of this long-lost bird. Standing up to 2.5-metre tall, the moa was the world's largest flightless bird. They once roamed in massive numbers throughout New Zealand. With no natural predators, the moa led a carefree existence - until the arrival of man. Hunted for their meat and feathers, the moa finally succumbed and by the 17th century was gone. Although most scientists are convinced the species is extinct there have been elusive but persistent sightings in the dense bush forests of the country's South Island. Through this sometimes light-hearted journey into the heartland of this most enduring of Kiwi legends, this film presents the more serious message that no amount of sightings, either hoax or otherwise, is going to bring back a species from extinction.