In nature clones occur naturally in plants, but not in animals. According to the National Human Genome Research Institute, animals must be scientifically manipulated through different processes to create an identical copy of the genetic material, known as cloning. This thought-provoking volume explores the history of cloning, the ethical issues it raises, where research may lead it in the future, and cloning's role in curing diseases, creating custom organs, improving food, and saving animals.