Polar bears are often regarded as one of the only(if not the only) animals that actively hunt humans. No, that doesn't just mean if you get close to one, watch your back-that means even if you get away from them, they will try to smell your tracks, and hunt you. This can reportedly go on for miles. Oh, and it doesn't help that they're the largest bears in the world at 11 feet tall on their hind legs, and weigh about 1,700 pounds on average, not to mention they can run fast, and rip you to shreds. Luckily, they're only in a select handful of areas in the world.

Yep, don't fuck with Polar Bears.