Discover the fascinating world of the Japanese Otter (<i>Lutra nippon</i>), an endangered species native to Japan's freshwater and coastal habitats. This social, tool-using mammal plays a crucial role in maintaining ecological balance and demonstrates remarkable adaptations for aquatic life, from its streamlined body to its diverse diet. Learn about its unique behaviors, reproductive habits, and the urgent conservation efforts necessary to protect this culturally significant and ecologically vital creature.