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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).
The narwhal is an odontocete or toothed whale, but unlike all other toothed whales it has no teeth in its mouth. Instead, the male develops a long straight tooth (or tusk) that protrudes 2-3 m out of the upper left jaw.he narwhalâs neck is not as flexible as a beluga. Male narwhals can reach a length of 5 meters (16 feet) and weigh up to 1,800 kg (4000 lbs). Females are slightly smaller, reaching a length of 4 meters (13 feet) and 1,000 kg (2200 lbs).