This book provides complete and up-to-date information on sika deer biology and its management, focusing on their life history with an integrated approach of population dynamics, morphology, genetics, and evolution. The expanding distribution of sika and its increase in population in Japan and other countries are causing damage to agriculture and forestry, impacting ecosystems and affecting other species. We are facing conflicting deer issues regarding the conservation of resource values and pest control of sika deer. This contributed volume compiles new findings focusing on the ecological plasticity of the sika deer. It aims to clarify the ecological characteristics of the deer by integrating studies of different approaches and provides a perspective for their management. The book consists of six parts. Part I introduces the ecological and management background behind the history of sika deer. The following four parts discuss movement ecology (Part II), impact on vegetation and bottom-up effect on sika deer (Part III), impact on ecosystem and its resilience (Part IV), and comparison of life-history characteristics between sika deer and other ungulate species (Part V). The last part (Part VI) covers the science-based management of sika deer. Contributed by recognized experts and young researchers of sika deer, this book appeals to researchers and professionals in wildlife biology and wildlife management, evolution, population dynamics, morphology, genetics, and reproductive physiology.