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Narwhals are whales. They live year round in the cold waters in the Arctic Circle.
Like all whales, they are mammals. This means they are warm-blooded and give birth to live babies.
Males can be 5 metres long and weigh up to 1,600kg. Females are usually 3.5 metres long and weigh around 1,000kg.
They feed on fish, squid and shrimp, beneath the Arctic pack ice. They are hunted by killer whales, polar bears and people.
What makes narwhals unusual is that the males have a long tusk. It is a long ivory tooth between 2 and 3 metres long.
This tooth sticks out like a horn, making the animals look like unicorns.
Deep divers
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