Bill Oddie, cameraman John Aitchison and sound recordist Chris Watson discovers the hidden lives of Britain's animals.
Bill kicks off by joining Chris in the Farne Islands for his final exploration into the normally inaudible. This time Bill wants to eavesdrop on puffins. Using a remote microphone, they immerse themselves in the sounds of puffins guffawing over only they know what hilarity. But Bill wants to go further, he wants to eavesdrop on a puffin burrow.
Next up, Bill sets John his most difficult challenge yet, to film dragonflies in flight. He has his work cut out for him. Dragonflies can fly at 30 mph and can change direction in a fraction of a second, making them almost impossible to follow with a telephoto lens.
Meanwhile, Bill enters into a light-hearted investigation of herbal plants. Their use is often thought of as new age, but it's actually very old age. In the seventeenth century a philosophy called The Doctrine of Signatures declared that a plant was able to heal the part of the body that it resembled. Many doctors of the day followed this principle. So were they right? Bill reveals all.
And finally, Bill takes a look at the highlights of the series.