Narwhals use their tusks to bat around fish in first documented case of narwhal play.

The long, spiral tusks of narwhals could be used by these Arctic ... seafarers brought these tusks home and passed them off as unicorn horns. "It almost seems like it was the strongest proof ...

Narwhal tusks are the stuff of legends — literally. Growing up to ten feet long, they were once believed by some medieval ...