Question

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The narwhal or the "unicorn whale" is one of nature's most mysterious animals. It lives in the arctic waters of the North Atlantic Ocean, off the coast of Canada and sometimes as far as Greenland and Russia. It is famous for its single tusk, or "unicorn", which sticks out just above its mouth. The tusk is even stranger because it's not centred on the whale's head, it is offset a little to the lef. The tusk is made of the same material as its teeth, and it's actually considered to be an extra tooth. It grows out to almost eight feel long, has a spiral shape and is hollow on the inside. The whales have been seen using it to compete with one another. About one in every 500 narwhals has two tusks. Some mammals, such as walruses and elephants, have tusks, but none are as strange as the narwhal's. A group of scientists from Harvard University's School of Dental Medicine made a discovery that has helped to better understand the tusk. They found that it has a very complex system with millions of nerves and sensors running through it. This allows the narwhal to detect things in its environment Scientists believe the whale can use it to detect how much salt is in the water so it knows where it's safe to swim. The tusk can be used as a hunting tool. It can sense tiny particles in the water, which may be able to help the narwhal recognise what kinds of fish are swimming nearby. Dentists and other marine scientists continue to study its tusk in hopes that it will help us learn how to strengthen our own teeth.​

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