15/20 The naturalist examines the revelations found from following fossilised animal tracks.
BBC Radio 4 Extra
Join a group of children as they find out all about this famous fish and its lifecycle.
14/20 Slaughtered into oblivion, the naturalist asks what lessons can be learned from the dodo.
13/20 Was the first live specimen of the primitive bony fish shown on TV really a living fossil?
12/20 The naturalist recalls finding an ammonite inside limestone, sparking his love of fossils.
David Attenborough hosts a celebration of bird impersonator Percy Edwards.
Tom Dyckhoff explores the way we design and build for animals.
BBC Radio 4
Beavers are native to Scotland, but for many years were extinct here - until now.
Find out about Scotland's red squirrels and how they are being protected.
Why do we live with cats and dogs?
BBC World Service