A colony of 150,000 giant tortoises, the flightless white-throated rail and the brush warbler are all to be found on the Seychelles atoll of Aldabra. So far, Aldabra has survived undisturbed by man. With the Royal Society's research programme coming to an end, what will the future be for this unique ecosystem?
Presenter Peter France Producer MICHAEL BRIGHT BBC Bristol
long wave only