Narwhals look like they swam out of a medieval legend, complete with a spiraling “horn.” That famous "horn" is actually ...

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The long, spiral tusks of narwhals could be used by these Arctic whales to stun or even kill prey, according to wildlife researchers who have spied on these elusive creatures using drones. They ...

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A 3D look inside a narwhal tusk uncovered a second spiral twisting in the opposite direction, creating a structure ...