The investigative minds at How to Survive analyze animal behavior, injury risks, and environmental conditions during a piranha feeding frenzy.

Whoa. This new video showing piranhas being fed in a Brazilian river is absolutely horrifying. As terrifying as this video appears, piranhas are rarely dangerous to humans. But as University of Nevada ...

It goes without saying that you could find some pretty dangerous animals if you were to travel back in time tens of millions of years ago, but not all of the creatures that lurked in prehistoric times ...