Sea Otter River Otter - Wonder Series Author:Sandra Chisholm Robinson, Gail Kohler Opsahl (Illustrator), Marjorie C. Leggitt (Illustrator) A story and activities book focusing on sea and river otters, both endangered species. The tone of the book is upbeat and its illustrations, activities, and stories focus on the playful mood of the otters, their intelligence, curiosity, and survival, not on habitat destruction or fur hunting. 64 line drawings.