Playful and popular, the sea otter is a favorite at zoos and aquariums. But the species almost vanished from the wild because humans valued its fur. Animals in Danger: Sea Otters tells the amazing story of the tool-using mammal and the challenges it faces in the twenty-first century. Cutting-edge science describes the animal's life in the sea and important place in the ecosystem. Generous images show the sea otter in the wild. An easy-to-follow glossary teaches new words while bonus features like Next Level Facts and a list of resources encourage readers to learn more.