Extreme Dinosaurs. Discoveries in South America have revolutionised thinking about the dinosaur world. Horizon follows scientists as they unearth the biggest carnivore ever discovered. It seems South America was home to both the largest meat-eater and the largest herbivore - at the same time in the same place. Could it be that they fought each other in a spectacular clash of the titans? Another edition is on Thursday at 9pm.
Producer Steve Ruggi ; Series Editor Bettina Lerner First shown on BBC
Knowledge www.bbc.co.uk/science/horizon