Furry swimmers are aquatic mammals that have thick fur coats to keep them warm in the water. Otters (6 letters) are a type of furry swimmer that can be found in rivers, lakes, and oceans around the world. Eared seals (10 letters) are another type of furry swimmer that are characterized by their external ear flaps and long front flippers. They inhabit coastal waters and are found in both the Northern and Southern Hemispheres.