What is a "sea otter"?

The sea otter is a marine mammal known for its adorable appearance and unique adaptations for life in the water. Sea otters have streamlined body with dense, waterproof fur coat that helps them stay warm in cold ocean waters. They have webbed feet and strong forelimbs specially adapted for swimming and diving. Sea otters also have flattened tail that acts like a rudder, aiding in their agility and maneuverability in the water. Sea otters are known for their playful behavior and social nature.