The ultimate team player of the animal kingdom, the gray wolf hunts in coordinated packs with military precision that would make Navy SEALs jealous. Individually, a wolf can sprint at 40 mph and deliver a 400 PSI bite—but its true weapon is pack tactics that can exhaust and overwhelm prey ten times its size. They don't fight fair, and that's exactly why they win.

A 900-pound mountain of muscle, fur, and fury, the grizzly bear can sprint at 35 mph and decapitate a moose with a single swipe. Its claws measure four inches long and its bite can crush a bowling ball. Equally comfortable fishing for salmon or mauling anything foolish enough to wander near its cubs.