Once the subject of mythical accounts of magical power, the helix-shaped tusk of the narwhal, or "unicorn" whale has proved to be an extraordinary sensory organ, according to a team of researchers ...

The marine biologist Jay Barlow likes to say that he went looking for the last of the Ice Age mastodons and instead bumped into a unicorn. It’s a land-based metaphor to help us, a landlubbing species, ...