Male and female narwhals only have two teeth, which are both in the upper jaw. The male’s iconic, spiralling tusk is in fact a canine tooth. It can grow up to three metres long. Narwhal tusks were ...

A narwhal tusk that is nearly seven feet long is extremely rare. Here's where you can see it in Massachusetts.

Though narwhals are classified as odontocetes (toothed whales), they literally have only these two teeth in their mouths.

Now, thanks to Arizona State University researcher Zackary Graham and his colleagues, we can add the "unicorn of the seas," the narwhal, to the list. They found that male tusks can have over 4 ...

Not much is known about the species of whale but new drone footage reveals at least one purpose for their mysterious tusks. More from Science Narwhals are an endangered species, with most of them ...

During their two-week August expeditions ... In 2014, Nweeia and his team published what he calls their “astounding” discovery: The narwhal tusk is a sensory organ that can detect subtle changes in ...

In narwhals, the left tooth erupts from their head, reaching more than 8-feet-long in some individuals. The tusk grows out in a spiral pattern, giving the appearance of a sea-dwelling unicorn. Credit ...

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 ...