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Life in the Undergrowth S1 Ep5: SupersocietiesDavid Attenborough reveals how animals first left the seas to colonise the land over 400 million years ago.

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Now PlayingLife in the Undergrowth S1 Ep5: SupersocietiesDavid Attenborough reveals how animals first left the seas to colonise the land over 400 million years ago.0The Life of Mammals S1 Ep1: A Winning DesignMammals regulate their temperatures and nurture their young on milk.