David Attenborough's Rise of Animals: Triumph of the Vertebrates

Part two of two. How mammals came to dominate the natural world

The naturalist concludes his two-part exploration of the evolution of vertebrates over the past 500 million years by looking at the history of mammals. He traces their journey from humble origins as tiny nocturnal forest-dwellers to their astonishing explosion in diversity and domination of the world following the death of the dinosaurs