5/20 David Attenborough reveals the life of insects that emerge from the earth every 17 years.
BBC Radio 4 Extra
4/20 David Attenborough explores the natural history of potatoes, peppers and artichokes.
3/20 David Attenborough's fascination with the fossilised evidence of the beginning of life.
2/20 David Attenborough muses over the peculiar Kiwi, a bird more mammal-like in its habits.
Join a group of children as they find out all about this famous fish and its lifecycle.
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