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What can animals teach us about staying healthy? A great deal, argues Cindy Engel. Animals, she says, are constantly self-medicating, eating anything from charcoal to leaves to ward off illness and to treat sickness. An animal behaviourist at the Open University, Engel came upon the new science of animal health while searching for a cure for her own illness. Now she has brought together all the knowledge of the field in a book. She tells Maggie McDonald a few secrets from the animal world-such as what leads sheep in the Shetlands to bite the heads off live Arctic…