The narwhal, an Arctic odontocete, has two horizontally embedded teeth at birth1. In males and a few females, the left tooth erupts at the end of the first year (K. A. Hay, personal communication) and develops into a spiralled tusk, which can be up to 260 cm long. It has been suggested that the tusk is used to disturb potential benthic prey2; to pierce prey before killing3; to pierce thin ice to make breathing holes4,5; as a defensive weapon4; as a cooling mechanism6, and as a sound transmitter7,8; but it is most probably used in display or fighting9–13. There is no mention in the literature of overt aggressive behaviour between narwhals or of scars on narwhals. We have found many scars on adult male narwhals. These, together with the high incidence of broken tusks in adult males and the burst of tusk growth at sexual maturity indicate that tusks are used in aggressive encounters.
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Turner, W. Proc. R. Soc. Edinb. 7, 759–760 (1872).
Freuchen, P. & Salomonsen, F. The Arctic Year (Putnam, New York, 1958).
Scoresby, W. Journal of a Voyage to the Northern Whale Fishery (Archibald, Constable, Edinburgh, 1823).
Tomilin, A. G. Mammals of the U.S.S.R. and Adjacent Countries, 9 Cetacea (Israel Program for Scientific Translations, Jerusalem, 1967).
Scoresby, W. An Account of the Arctic Regions with a History and Description of the Northern Whale Fishery 1 The Arctic (Archibald, Constable, Edinburgh, 1820).
Dow, P. R. & Hollenberg, M. J. Oral Surg. 44, 135–146 (1977).
Best, R. C. thesis, Univ. British Columbia, (1972).
Ford, J. K. B. & Fisher, H. D. Can. J. Zool. 56, 552–560 (1978).
Beddard, F. E. The Cambridge Natural History 10 (Macmillan, London, 1920).
Norman, J. R. & Fraser, F. C. Field Book of Giant Fishes, Whales, and Dolphins (Putnam, New York, 1949).
Mansfield, A. W., Smith, T. G. & Beck, B. J. Fish. Res. Bd Can. 32, 1041–1046 (1975).
Low, A. P. Report on the Dominion Government Expedition to Hudson Bay and the Arctic Islands on Board the D.G.S. Neptune, 1903–1904 (Government Printing Bureau, Ottawa, 1906).
Miller, R. S. Arctic 8, 167–176 (1955).
Buckland, F. Notes and Jottings from Animal Life (Smith, Elder, London, 1882).
Silverman, H. B. thesis, McGill Univ. (1979).
Best, R. C. & Fisher, H. D. Can. J. Zool. 52, 429–431 (1974).
Geist, O. W., Buckley, J. L. & Manville, R. H. J. Mammal. 41, 250–253 (1960).
Brown, R. Proc. zool. Soc., Lond. 35, 533–556 (1868).
Porsild, M. P. J. Mammal. 3, 8–13 (1922).
Norris, K. S. UCLA Forum med. Sci. 7, 225–241 (1967).
McCann, C. Sci. Rep. Whales Res. Inst. 26, 145–155 (1974).
Yablokov, A. V., Bel'Kovich, V. M. & Borisov, V. I. Whales and Dolphins (Joint Publications Research Service, Arlington, 1974).
Caldwell, D. K. & Caldwell, M. C. The World of the Bottlenosed Dolphin (Lipincott, Philadelphia, New York, 1972).
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