The narwhal, or narwhale (Monodon monoceros), is a medium-sized toothed whale and possesses a large tusk from a protruding canine tooth. It lives year-round in the Arctic waters around Greenland, Canada, and Russia. It is one of two living species of whale in the Monodontidae family. Inuit people, who call a tusked narwhal qilalugaq tugaalik, are allowed to hunt this whale species legally for subsistence. Narwhals have been extensively hunted the same way as other sea mammals, such as seals and whales, for its large quantities of fat which are one of the most important resources of the native people in Arctic regions. Almost all parts of the narwhal, meat, skin, blubber and organs are consumed. Whale is the common name for various marine mammals of the order Cetacea. All cetaceans have forelimbs modified as fins, a tail with horizontal flukes, and nasal openings (blowholes) on top of the head. Whales inhabit all the world's oceans and number in the millions. Human hunting of whales from the seventeenth century until 1986 radically reduced the populations of some whale species. They are long-lived, humpback whales living for up to 77 years, while bowhead whales may live for more than a century. Whales by Robert Hamilton, 1843.