It is the only whale species that spends its life in the arctic region, including the winter season.
The most striking feature of the narval, also known as narwhal or narwhal, is the horn-like protrusion, in fact, the tooth spiraling from the left side of its upper jaw. This tooth, which is usually found in the males of the species, is also rarely seen in the females. The tooth, which can extend up to 3 meters and weigh up to 10 kg, has more than 10 million nerve endings. Another feature of this tooth, which does not grow back when broken, is that it can stretch for half a meter without breaking. From time to time, narwhals try to clean their teeth from shellfish accumulated on the tooth surface by rubbing their teeth against each other (tooth grinding). This tooth, whose function is still unsolved, is thought to be a sensory organ (to detect vibrations in water, salt content, pressure and temperature of water, etc.).
Narvals, one of the deepest-diving creatures in the mammal class, are estimated to live 40 to 50 years.