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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).
1 The Inuit community prizes Narwhals for its skin which is known as âMattakâ or âMuktukâ that is a known delicacy because of the thin layer of fat. 2  Narwhals can dive up to 1500 meters deep, a dive that takes about 10 â 25 minutes.  The shape of a Narwhalâs tail flukes is adapted to particularly reduces drag.