The natural world was transformed when one great ape began to walk upright - us. But why has this led to the development of our extraordinary brains?

http://www.bbc.co.uk/nature/animals/mammals/tv/

This is the final episode of the series

Part 1: A winning Design
http://www.videosift.com/video/Life-of-Mammals-Part-1-A-Winning-Design
Part 2: Insect Hunters
http://www.videosift.com/video/Life-of-Mammals-Part-2-Insect-Hunters
Part 3: Plant Predators
http://www.videosift.com/video/David-Attenborough-The-Life-of-Mammals-3-Plant-Predators
Part 4: Chisellers
http://www.videosift.com/video/David-Attenborough-The-Life-of-Mammals-4-Chisellers
Part 5: Meat Eaters
http://www.videosift.com/video/David-Attenborough-The-Life-of-Mammals-5-Meat-Eaters
Part 6: The Opportunists
http://www.videosift.com/video/David-Attenborough-The-Life-of-Mammals-6-The-Opportunists
Part 7: Return to the Water
http://www.videosift.com/video/Life-of-Mammals-Return-to-the-water
Part 8: Life in the Trees
http://www.videosift.com/video/David-Attenborough-Life-of-Mammals-8-Life-in-the-Trees
Part9: The Social Climbers
http://www.videosift.com/video/David-Attenborough-Life-of-Mammals-9-The-Social-Climbers