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For both sexes, excluding the male's tusk, the total body size can range from 3.95 to 5.5 m (13.0 to 18.0 ft); the males are slightly larger than the females. The average weight of an adult narwhal is 800 to 1,600 kg (1,800 to 3,500 lb).
Male narwhals feature a unique, defining physical characteristic: a long protrusion from the upper left jaw that looks like a tusk or a horn. In medieval times, people believed that narwhal tusks were the horns of the legendary unicorn.In reality, though, a narwhal tusk is not a unicorn horn.he narwhal, of course! Sometimes called âthe Arctic unicorn ,â narwhals are small whales (about 15-16 feet long) that live in the icy waters of the Atlantic and Russian areas of the Arctic Ocean, near Canada and Greenland. Narwhals are most closely related to the beluga whale.