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Narwhal tusks are really an “inside out” tooth
Narwhals are unlike most other whales because they have what appears to be a giant tusk. But that’s not actually a tusk at all—what you’re seeing is a tooth. Harvard University’s Martin Nweeia told the BBC that the “tooth is almost like a piece of skin in the sense that it has all these sensory nerve endings,” adding that it’s “essentially built inside out.”
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