David Attenborough's Natural Curiosities: Impossible Feats

Sir David Attenborough examines the mysteries behind some of nature's most fascinating creatures and plants. It is said that fleas can jump the equivalent to us leaping over St Paul's Cathedral and it is famously quoted that cheetahs can run at speeds of 70 miles per hour. But are these claims really true? The discovery of the world most elastic natural protein in insects and the development of a hi-tech tracking collar have help reveal the true facts. So can these creatures really achieve what should be physically impossible?