Hippopotamus
Although the Hippopotamus is mostly a herbivorous mammal, they can be very dangerous. The Hippo is very aggressive and territorial. Due to its large stature (it is the third-largest land mammal), sharp teeth and good mobility, it can be a deadly creature. Males can average around 3,300 pounds (1,497 kg). Many reports have been made about Hippos attacking people both in the water and on land. Therefore, its best to stay away if you see one, in the wild.