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Sea otters are marine mammals that belong to the Mustelidae family. They are known for their playful behavior, dense fur, and webbed feet. Sea otters spend most of their time in the water, where they feed on a diet of seafood such as clams, mussels, and sea urchins. They are excellent swimmers, capable of diving to great depths to forage for food. Sea otters are also known for using tools, such as rocks, to crack open shellfish. These charismatic animals are found along the coasts of the northern Pacific Ocean, from Alaska to California.