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.

Don't let the pudgy appearance fool you—the hippopotamus is widely considered the most dangerous large animal in Africa, killing more humans annually than lions, leopards, and crocodiles combined. Its massive jaws open to a terrifying 180-degree angle and generate 1,800 PSI of bite force through foot-long canine teeth. At 4,000 pounds, it can outrun most humans on land and is absurdly agile in water.