Narwhals are are sometimes called the unicorns of the sea, they are a pale-coloured porpoise found in Arctic coast waters. These animals have two teeth. Males have a prominent tooth that grows into a spiral tuck up to 8.75 feet in lenght. This tusks made of ivory grows right through the upper lip. Females will sometimes grow a tusk but does not get to be the same size of the males. It is not certain what the tusk is used for but some scientists believe it could be for mating rituals, or perhaps to battle rival suitors.
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