The famous naturalist looks at why underground animals evolved in a very different way from those on the surface. From 2009.
Underground animals are very different to the animals that spend their life on the surface.
They are a different shape, their senses are tuned in a very different way and they manifestly come from a different world.
Does this explain the stare of the snake?
Series of talks by Sir David Attenborough on the natural histories of creatures and plants from around the world.
Sir David has been awarded the Knight of the Grand Cross of the Order of St Michael and St George, for his services to TV, broadcasting and conservation.
Producer: Julian Hector
First broadcast on BBC Radio 4 in August 2009.
