Narwhal (S/F-JWE)

The narwhal (Monodon monoceros) is a species of medium-sized whale in the family Monodontidae. It is one of only two surviving species in this family, the other being the beluga. It is native to the southern Arctic Ocean and feeds on fish, cephalopods, and crustaceans. Male narwhals have a distinctive forward-facing tusk which arises from its left canine tooth and can grow up to 3 meters (9.8 feet) long. The males are also larger and heavier, with their tail flukes bent inward to compensate for hydrodynamic drag caused by the tusk. Sometimes, a female will grow a tusk, and on rare occasions a male may have tusks formed from both of its canine teeth. Narwhals first evolved during the late Pliocene, roughly three million years ago. They are currently considered a species of least concern by the International Union for Conservation of Nature, although they are threatened by whaling and sea ice reduction.