(I)The Arabian oryx, a creamy white antelope with long graceful horns, had been hunted almost to extinction. (II) The Fauna Preservation Society, with WWF help, mounted an expedition to capture a few of the last thirty (III).But. without doupt. the WWF's most successful effort has been the conservation of the polar bear. (IV) They shipped them to the Phoenix Zoo in Arizona. (V) There, through captive breeding, they have become the nucleus of a world herd.