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Don't be fooled by their sluggishness - hippos are one of the most dangerous animals that attack people even without reason. Fortunately, you have no reason to worry if you don't live in Africa, near their natural habitat.
Crocodile is one of the most dangerous animals and its size and constitution don't help. It will eat literally anything, and you don't want to be around when it's hungry. Some crocodiles even have the technique of drowning their prey so it doesn't have the slightest chance of escaping.
Elephants are one of the largest animals on Earth, very strong and sometimes aggressive. There have been cases where elephants have destroyed whole villages for an unknown reason. They may seem cute sometimes, but never underestimate their power and size.
Mosquitoes are responsible for few million deaths every year, which makes them the deadliest animal on the planet. They are nearly everywhere but not every bite is fatal. However, it's better to prevent than feel sorry after, so take care when you're in the same area as mosquitoes.
What makes leopard one of the most dangerous animals in the world is the strength it gets when it's wounded. Unlike many other animals who will retreat when hurt, the leopard will become even more furious and stronger. Their pray rarely has the chance to survive.