The idea of human-nonhuman combinations has been a recurrent theme throughout the history of humanity. From the myths of the Minotaur and the centaurs in ancient Greece to the dogheads of the Middle Ages right through to the monsters of modern science fiction, these beings have always been a source of fascination. In recent years, however, biomedical advances have demonstrated the potential to make these entities a reality through the creation of inter-species combinations. As a result, pressing and perplexing ethical questions arise. Introducing the reader to the historical context of human-nonhuman experimentation and potential future developments, this volume offers clarification, analysis and a thorough overview of the ethical challenges relating to human-nonhuman chimeras, true hybrids, cybrids and other combinations. This book is the first accessible survey of the different ethical dilemmas facing contemporary society in the creation of human-nonhuman embryonic, foetal and postnatal entities. These include important cultural, legal, philosophical and religious perspectives. As such it will act as a springboard for future debate.