Written for a new field currently lacking a proper textbook, it relates the embryo to its environment, and demonstrates how development in nature is different from development in the laboratory. This book introduces a new field of Biology that is currently lacking a textbook. The coverage provided intersects numerous disciplines. The book provides new and important perspectives on Ecology, Conservation Biology, Cancer Biology, Ageing Research, Medicine, and Evolution; and allows students to approach the study of nature in a new way.This is a text for a new field of Biology that relates the embryo to its environment. Intersecting numerous disciplines in the Biological and Life Sciences, the authors have provided coverage in which the molecular biology of epigenetic development meets and interacts with the evolutionary aspects of phenotypic plasticity.