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Although Charles Darwin is especially well known for his work on the Theory of Evolution through his seminal work "On the Origin of Species", he also published a lot of his research on earthworms. Earthworms fascinated Darwin, so much so that his observations led him to believe that they showed marked intelligence. And earthworms fascinate Sir David Attenborough too. He recalls a visit to Australia to film the giant earthworm and intriguingly used his ears more than any other sense to find them. What did they sound like and what did they look like? Sir David reveals all. Producer: Julian Hector First broadcast on ÃÛÑ¿´«Ã½ Radio 4 in March 2011.