Narwhal

The narwhal (Monodon monoceros), also known as the narwhale is a medium-sized toothed cetacean that possesses a large "tusk" from a canine tooth. It is one of the two extant species in the family, Monodontidae, the other being the beluga whale. Narwhals are found in Arctic waters in Canada, Greenland, and Russia. Narwhals are a specialized predator in the Arctic, feeding on many species of flatfish, such as the Greenland halibut, as well as cod. Narwhals can live up to 50 years, though they are often killed by suffocation after being trapped in sea ice, starvation, and predation by orcas.