Real sea monkey?

One smallish fur-bearing creature that Steller reported sighting at sea has never been seen since then. It was a playful animal with a head like a dog and a fat hairy body, and it cavorted around the ship for two hours. Steller called it a sea ape; he thought it must be an oceangoing primate. Today's cryptozoologists keep Steller's sea ape in their list of mysterious mammals, along with the Asian Yeti and American Bigfoot. Most people think it must have been a monk seal.