Title: 7 Fascinating Facts About Narwhals | Mental Floss
Headings: 7 Fascinating Facts About Narwhals
7 Fascinating Facts About Narwhals
1. Its tusk is actually a tooth
2. The tusk can grow to be 10 feet long
3. It can bend about a foot before breaking
4. We’re not entirely sure what it’s for
5. Not all narwhals have tusks
6. Their skin is rich in vitamin C
7. There are none in captivity

Content: No big surprise. It's been opposite in every other way,” Martin Nweeia, a clinical instructor at the Harvard School of Dental Medicine, told NPR after making this discovery. “ But to find a tooth that is soft on the outside and has its most dense part around the pulp was completely odd.” 2. The tusk can grow to be 10 feet long
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Narwhal tusks grow throughout the animals’ entire lives and can reach incredible lengths. While the tusk as a whole is straight—the only straight tusk we know of, in fact—a closer look reveals that as it grows, it spirals to the left. 3. It can bend about a foot before breaking
Its tough core and soft outer layer result in a tusk that is both strong and flexible. It can bend significantly without cracking, which is important for a tusk as long as the narwhal’s. 4.