Just over 400 million years ago creatures left the seas to move onto land. They were the invertebrates. Since then they have become the most successful group of animals, adapting to every environment on earth. Now, for every human there are 200 million of them. Their largely unseen world is now revealed as David Attenborough tells the story of the land-living invertebrates.
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Length: 49:50 Posted: 4/20/2009
