Narwhal (Closeup)

Like all whales, narwhals need to surface for air, providing a good opportunity to spy their impressive eight-foot-long spiral tusks. The tusks are actually extremely long incisors that protrude from the left side of the jaw of male narwhals. While the tusk's purpose is unknown, some scientists believe it is used in mating rituals to impress females or to battle rival suitors. These “sea unicorns” often travel in groups of 15 to 20 and have been known to gather in the hundreds.

Scientific name: Monodon monoceros
IUCN Red List: Data Deficient
Region: Arctic, Oceans