A natural history portrait of a year in Yellowstone, following the fortunes of America's wildlife icons as they face the challenges of one of the most extraordinary wildernesses on Earth.

Anatomist Neil Shubin reveals how our bodies are the legacy of ancient fish, reptiles and primates.

Anatomist Neil Shubin reveals how our bodies are the legacy of ancient fish, reptiles and primates.

It took more than 350 million years for the human body to take shape. Anatomist Neil Shubin reveals how our bodies are the legacy of ancient fish, reptiles and primates - the ancestors you never knew were in your family tree.

In the final episode, Neil tracks our hands, feet, colour vision, spine and upright gait to our primate and hominid progenitors, who also passed on perhaps the most important legacy of all - a path to the human brain.