A new four-part series about the animals who have changed the face of the planet and influenced human affairs through their close relationship with people.
1: The Horse. Brian Leith hears about Genghis Khan, the Wild West and the Industrial Revolution as he explores the impact of the horse on both human history and the landscape.
Producer Jan Castle. E-MAIL: nature@bbc.co.uk WEBSITE: www.bbc.co.uk/nature