Follows shark experts investigating reports of bull sharks and saltwater crocodiles clashing along Australia's Daintree River to determine which is the top predator.
David Attenborough follows the remarkable story of the discovery of fossils in the Patagonia region of Argentina which prove to belong to the largest animal to ever walk the Earth.
Run Time: 1 hours 00 minutes . Uploaded: 2021-01-02 00:26:41