Narwhal (Monodon monoceros) is an arctic cetacean, famous for its tusk, belong to Monodontidae (one of two whale species in the family along with Delphinapterus luecas). They live in arctic coastal waters and rivers. They are known as seasonal migrants that travel between bays and fjords in the summer and deep offshore area heavily packed in ice in the winter. In summer months, they move closer to coast which is an ice-free waters (usually in shallow one) then move offshore in winter to a deeper waters with densely packed ice on top of it though sometime surfacing in small leads in the ice (Laidre et al, 2002). They prefer deep or offshore waters almost in all area of occurrence and rarely seen south of 65oN latitude (Hay and Manfield, 1989). Supported by their ability to do deep dives and blubber up to 35% of their body weight insulation, living in a deep freezing water by the winter is not a problem.
- Laidre, K.L., Heide-Jørgensen,M.P., & Dietz, R. 2002. Diving behaviour of narwhal (Monodon monoceros) at two coastal localities in the Canadian High Arctic. Canadian Journal of Zoology, 80, 624-635.
- Hay, K. A. and Mansfield, A. W. 1989. Narwhal Monodon monoceros Linneaus, 1758. In: S. H. Ridgway and R. Harrison (eds), Handbook of marine mammals, pp. 145-176. Academic Press, London, UK.
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