What are the narwhals up to? Generally, we don't really know! They are mysterious creatures. NPR science correspondent Nell Greenfieldboyce talks... Narwhal sightings are rare. Scientists just saw ...

One has been depicted with two tusks. Narwhals, Monodon monoceros, are toothed whales that live mostly in Arctic coastal waters and inlets. Male and female narwhals only have two teeth, which are both ...

The tusk — actually a very long tooth — is seen primarily in male narwhals and appears rarely in females. There have been a variety of proposed purposes for the tusk. Its primary function is ...

Like walruses and elephants, male narwhals (Monodon monoceros) grow tusks; these are modified teeth. In narwhals, the left tooth erupts from their head, reaching more than 8-feet-long in some ...

Each male has a tusk, and occasionally two tusks, but fewer than 15% of females have one. The narwhal tusk is a marvel of engineering. It is both very strong and very flexible – which is unusual ...