Before man ruled the world, Earth was a land of giants. Count down the biggest beasts of their kind to ever roam the planet in this eye-opening special, and uncover the secret lives of these supersized species.
Sir David Attenborough's encounter with mountain gorillas during the filming of Life On Earth (1978) is one of the greatest moments in television history. In this journey of re-discovery, Sir David recounts his very personal experiences with the mountain gorillas of Rwanda.
In this episode, Richard focuses on the 'KT boundary'. 65 million years ago, a 10 kilometre diameter asteroid collided with the Earth and saw the end of the long reign of the dinosaurs. He investigates the lucky breaks and evolutionary adaptations that allowed some species to survive the disastrous end of the Cretaceous Age when these giants did not.