These round, large hippos may seem like animals that only eat and hang out, largely due to the game Hungry, Hungry Hippos. But they’re much more dangerous than you think. These water-loving creatures act docile, but they can cause death by drowning. They’ve also charged at humans. Don’t be fooled by their yawn, either, since it’s an aggressive signal that’s warning you to stay far, far away. It’s been referred to as the world’s most dangerous land animal and kills up to 500 people per year in Africa. In fact, recently, a CNN headline reported that a two year old boy was rescued from a hippo while playing in his own back yard in Uganda. The hippo had already swallowed half of the toddler’s body before a brave neighbor stoned the hippo and pulled the boy from its jaws. (via Best Life Online).