David Attenborough's First Life

Part two of two. How animals began to survive on dry land

In the conclusion of the two-part documentary, the naturalist travels to Burgess Shale in Canada's Rocky Mountains, where he explores how evolution gained pace once creatures developed mouths and mobility. In Scotland, he reveals that one of the smallest fossils found holds the secret to how animals began surviving on dry land, and explains the bloom of life during the oxygen-rich Carboniferous period