41. Only slightly damaged, " Narwhal " departed her patrol area the next day. 42. Beluga, bowhead whale, harp seal, narwhal , and ringed seal frequent the area. 43. Also, there is only 1 recorded case of a duel horned female narwhal ( e) 44. In 1978, he joined the Navy and served six years aboard the nuclear submarine USS Narwhal . 45. In medieval and Renaissance times, the tusk of the narwhal was sometimes sold as unicorn horn. 46. The Throne Chair of Denmark is made of " unicorn horns " almost certainly narwhal tusks. 47. Entire horns were very precious in the Middle Ages and were often really the tusks of narwhals . 48. Narwhals do not have a dorsal fin, possibly an evolutionary adaptation to swimming easily under ice.49. The study found that the dietary needs of the narwhal did not differ among genders or ages. 50. Stephen Maturin also brings aboard a narwhal tusk given him by Aubrey from a previous Baltic voyage.
