Natural World: Animal Weapons

Professor Doug Emlen examines how animals use their bodies as weapons in epic battles to gore, stab, crush and batter their adversaries to death, from elephants to rhinoceros beetles, assessing whether they are more than just instruments of blunt force. For the professor this has been a lifetime's ambition to discover the secrets of nature's arms races, what triggers them and what they can teach us about the most formidable weapons on Earth - our own