The Sea Otter is a playful creature, often seen backstroking in the ocean waters. With lush, chocolate-brown fur that can contain up to a million hairs per square inch, they maintain a warm and buoyant body. They possess a small and round face, with keen, alert eyes and a button-like nose. Interesting thing, they don't have a layer of blubber to keep warm like other marine mammals, but rely on their dense fur.