This curriculum guide is all about otters and provides information on both sea and river otters. Included are activities related to the diet of sea otters, the adaptations sea otters have made to live in the sea, their tool-using abilities, where they live and how to spot them, comparative anatomy of sea and river otters, and otter movement. The activities employ an interdisciplinary approach and use mazes, puzzles, model-building, and board games to motivate students. A glossary, bibliography, and answer keys for some of the activities are also provided. Contains 22 references. (DDR)