Narrated by John Bach (Duggan), this documentary investigates the moa — the "tallest bird that ever walked the earth". Nine species of the flightless bird with 'leg bones like those of a horse' flourished in ancient New Zealand but they couldn't survive humans. Animation and puppetry is used to depict the moa in its original environment. The documentary visits Fiordland to investigate a 1993 moa 'sighting' and palaeontologist Trevor Worthy extracts bones from an ancient swamp that claimed hundreds of victims. A farming contractor describes his awe at stumbling across a moa graveyard in a Hawke's Bay cave.