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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).
(Photo: National Institute of Standards and Technology). Narwhals are the Unicorns of the sea-and now, researchers know why the whales sport that distinctive horn. Narwhals are toothed whales, and the horn of the male can grow to be as long as eight-and-a-half feet long.The unusual feature is the left canine tooth of the males, which breaks through the upper lip of the male.Photo: National Institute of Standards and Technology). Narwhals are the Unicorns of the sea-and now, researchers know why the whales sport that distinctive horn. Narwhals are toothed whales, and the horn of the male can grow to be as long as eight-and-a-half feet long.