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Sir David Attenborough examines the mysteries behind some of nature's most fascinating creatures and plants.

Humans are not alone in using medicines against injuries and infection. Some animals protect themselves with natural remedies in the most extraordinary ways. Hippos produce a blood-red 'sweat' that acts as a sunblock and helps fight infections, while capuchin monkeys rub themselves with insect-repellent leaves to protect themselves from insect bites.

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's most elastic natural protein in insects and the development of a hi-tech tracking collar have helped reveal the true facts. So can these creatures really achieve what should be physically impossible?