The animal known as the "cat of the sea" is the sea otter. This charming marine mammal is often likened to cats due to its playful behavior, dexterity, and social nature. Sea otters are equipped with thick fur to keep warm in cold waters and are skilled at using tools, such as rocks, to crack open shellfish. They are also important to their ecosystems, as they help maintain kelp forest health by preying on sea urchins. Known for their endearing antics and adorable appearance, sea otters have captured the hearts of many wildlife enthusiasts and conservationists.