Sea otters must spend a lot of time grooming each day in order to stay warm in the chilly waters of the Pacific Ocean. They somersault and rub their fur, which traps air bubbles in their fur to insulate them against the cold water.
Sea otters have the densest fur of any mammal – up to one million hairs per square inch – that is more hair in one square inch than on the entire head of a human! Unlike other marine mammals, sea otters do not have blubber.
Occasionally sea otters will cover their eyes with their paws while they sleep or rest.