New discoveries shed light on the evolution of early dinosaurs, such as the tiny Eoraptor, the bizarre-looking crested dinosaurs of the Jurassic and the giant carnivores, such as Tyrannosaurus Rex.

Take a leap back in time to an ancient watering hole, where predators and prey co-exist. This episode reveals the complex social systems of dinosaurs such as giant sauropods, flying reptiles, huge carnivores and a plant-eater with a tail like a bullwhip.

From finding safety in numbers to using special abilities to avoid becoming prey, revolutionary adaptations that different species used to survive are exposed.

An up-close and personal look reveals how the Tyrannosaurus Rex lived and nested. Then, a lone Troodon, "the last dinosaur", struggles to survive in a post-apocalyptic world.