The picture of the tuna covered in cookie cutter shark bite marks. These small sharks lock onto their prey using suction, then use their razor-like teeth to bite out chunks of flesh.

Recently in Australia, fishers reeled in a glistening blue swordfish riddled with egg-shaped holes, as if the fish had been mutilated by a melon-baller. The wounds were fresh—open portals into ...

The cookiecutter shark is actually a very small species that lives in the deep ocean below 3,200 feet. At night, however, the sharks rise to the surface in order to feed, and it's the way they ...