Known as the killer whale despite technically being the world's largest dolphin, the orca is the ocean's most intelligent and ruthless predator. Hunting in pods with coordinated strategies that include creating waves to wash seals off ice floes, they've been observed killing great white sharks purely for their livers. The apex predator of apex predators—nothing in the sea hunts an orca.

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?'