More than half of all the sounds in a wildlife documentary are generated artificially. Be prepared for a few surprises as Simon Fanshawe lifts the lid on some of the bizarre techniques used to mimic the noises of the natural world. Find out why created audio is often superior to the real thing, and why a pillowcase full of cornflour and a pairof rubber gloves are essential props in the BBC Natural
History Unit's dubbing theatre. producer Alison Ayres Faking the sounds of nature: page 35