30/04/2023
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. If you're looking for a concrete explanation as to why things evolved in this way, you'll just have to sit tight. Even the scientists don't get it.
As Martin Nweeia, a member of the Harvard School of Dental Medicine, told the Smithsonian, "The whole thing that is great about the teeth of the narwhal is that nothing makes sense … The tusks are an extreme example of dental asymmetry."