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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).
Narwhals inhabit waters above the Arctic Circle, right up to the edge of the ice cap. The species is often found around pack ice. In the summer, narwhals migrate to cold, deep fjords and bays closer to land.