The naturalist recalls the key moment of finding an ammonite inside some limestone - sparking his love of fossils. From 2009.
Sir David recalls a key moment in his life, when he broke open a piece of Leicestershire limestone and there in his hand was an ammonite.
Over the intervening years, fossils have fascinated him and he has become a great collector, even of the odd fake.
Series of talks by Sir David Attenborough on the natural histories of creatures and plants from around the world.
Producer: Julian Hector
First broadcast on BBC Radio 4 in August 2009
