Although they are mostly herbivorous, they are highly aggressive and are regarded as one of the most dangerous animals in Africa. They have been known to attack without provocation, even to the point of destroying entire vehicles. Around 2,900 people are killed every year by hippos.
5. Scorpions
One of the oldest creatures to inhabit the earth, scorpions evolved from sea-dwelling creatures to land menaces around 340 million years ago. There are around 1,300 to 2,000 species of scorpions in the world, but only 25 of them have poison that is strong enough to kill humans. Nevertheless, anywhere between 1,000-5,000 people each year are killed by scorpions.