Narwhals are medium-sized toothed whales found in the Arctic waters off the coasts of Greenland, Canada, and Russia.
Narwhals eat a variety of fish, squid, and shrimp.
They are known as "unicorns of the sea" because of their long, spiralled tusk, which is actually an expanded tooth.
Male narwhals usually have tusks, and some may have two.
The tusk can grow to be up to 10 feet long and may be used for communication, navigation, and competing for mates.
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