Videos show narwhals using their tusks in several ways, including prodding and flipping a fish. It’s the first reported evidence of the whales playing.

And what was the source of the horn given to Emperor Ferdinand? In the late stages of the 16th century, European explorers ...

They captured footage of narwhals using their tusks to mess with fish, and even saw a narwhal repeatedly strike a fish with its tusk. But narwhal experts don’t agree on what these observations mean. A ...

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 in the upper jaw. The male’s iconic, ...

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.

Where do they go? How many are there? What's with the tusk? Narwhals (in the Arctic Ocean) have inspired myth and wonder but are still little known to science. Flip Nicklin / Minden Pictures Even ...

They captured footage of narwhals using their tusks to mess with fish, and even saw a narwhal repeatedly strike a fish with its tusk. But narwhal experts don't agree on what these observations mean. A ...

The narwhal, often referred to as the “unicorn of the sea” in a nod to its trademark tusk, has long remained an enigma. Scientists have observed few interactions of narwhals in their natural ...

The most extraordinary feature of the narwhal is the long, spiral tusk which always has a left- handed spiral. No one is sure why it twists this way. The tusk, which measures up to 3m in length ...

On this week's episode: using magnets for brain surgery, fish use tools to find food, cold plunges actually have health benefits, and narwhals use their iconic tooth for play.