Some cool facts about the sea otter are that they are one of the only species known to use tools. The sea otter has 600,000 hairs in one square inch of his fur. Some sea otter skins are sold separate. Sea otters wrap themselves in kelp, when they sleep, so they don't drift away. Sea otters can live in water that is 30 to 50 degrees Fahrenheit.
Sea otters are important because they help control the sea urchins which feed on kelp.
If their were too many sea urchins the kelp forests would be destroyed. The sea otters have to fight hard for their lives. Millions are killed every year. Humans kill them for their fur and they nearly came extinct at one time. Some are now protected by International Agreement, Endangered Species Act, and the Marine Mammal Protection Act.