A series about animals who have changed the face of the planet and influenced human affairs through their close relationship with people. 3: The Cow. It is hard to believe that the cows peacefully chewing the cud in the corner of a field have been responsible for changing the face of the world almost beyond recognition, but that is exactly what the cow has done. Brian Leith investigates the effect of this animal on history. WEBSITE: www.bbc.co.uk/nature. E-MAIL: nature@bbc.co.uk Producer Jan Castle