Despite its intimidating appearance, the hippo is one of Africa's most underappreciated creatures in terms of fearlessness and potentially violent disposition. Hippos are one of Africa's largest animals, and they aren't known for being cheerful, and they kill more people each year than lions, leopards, crocodiles, or any other significant predator. If you want to see how hippos’ rule, keep watching as we count down 12 times hippos attacked their enemies.