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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).
Physical Characteristics. The narwhal whale is unique animal among the whale species as it is the only cetacean that is known to have a long ivory tusk that extends from the upper left side of its jaw, which can measure up to 7 â 10 feet in length.