Narwhal: The narwhal is a medium-sized toothed whale and possesses a large “tusk” from a protruding canine tooth (which makes them look like underwater unicorns). It lives year-round in the Arctic waters around Greenland, Canada, and Russia. Read more at
The Nautilus, Greek for 'sailor', is a mollusk that has survived unchanged for millions of years. They represent the only living member of the subclass Nautiloidea, and are often referred to as 'living fossils'.