Kangaroo
“What, the bouncy little kangaroo? What is he doing on this list?” you may be saying – if you aren’t Australian. But kangaroos aren’t that little, are rarely afraid of humans, and have no problem being vicious. Their powerful punches and kicks can do serious damage to a human, and they have been known to stalk or wait for people before attacking. Of course, it makes sense after a little thought – they have to be mean enough to survive everything else in Australia.