8. Hippopotamus

After the elephant and rhinoceros, the hippopotamus is the third largest type of land mammal and the heaviest extant artiodactyl. They are usually found in Africa and are responsible for more human fatalities on the continent than any other large animal. Male and female hippos tend to have different reasons for attacking. A male hippo will defend its territory, which runs along the bank of a river or lake, whereas the female becomes aggressive in defending her young. They killed more then 200 every year.