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Scientists discover how narwhals grow nature's only straight tusk
Narwhals have nature's only straight tusk, a single tooth up to three meters (10 feet) long, so strange they were sold as magical unicorn horns during the Middle Ages.
Summary
Narwhals have nature's only straight tusk, a single tooth up to three meters (10 feet) long, so strange they were sold as magical unicorn horns during the Middle Ages. The tusks have fascinated scientists ever since, but they have proven extremely difficult to study because these odd-looking, blubbery whales spend most of their lives under the Arctic ice.
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