If you run into this terrifying animal, immediately "put your hands behind your back"

image: Fazwick/Shutterstock

If you happen to be in Australia or New Guinea and encounter a massive black bird stomping around on two feet, beware. Known as "the world's most dangerous bird," cassowaries can be as much as six feet tall and weigh more than 150 pounds. Their dagger-like claws can easily puncture, slice, and dice any animal that threatens it.