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.

The largest land carnivore on Earth, the polar bear is a 1,500-pound Arctic killing machine perfectly engineered for sub-zero survival. Its paw swipe can decapitate a seal in one motion, and it can smell prey from 20 miles away across frozen tundra. Evolution looked at the grizzly bear and said 'what if we made it bigger, meaner, and gave it a fur coat rated to negative 50?'