The hippopotamus has a torso that is shaped like a barrel, a very big mouth and teeth, an almost hairless body, short legs and great size. It is the third largest land mammal, judging by its weight, which is between between 1½ and 3 tonnes. The white rhinoceros weighs 1½ to 3½ tonnes, and the three species of elephant weigh 3 to 9 tonnes. Even though it has short, fat legs, it can run more quickly than a human. Some hippos have run at 30 km/h (19 mph) for short distances. The hippopotamus is one of the fiercest animals in the world. It is often called one of the most dangerous animals in Africa. There are about 125,000 to 150,000 hippos in Sub-Saharan Africa. Zambia (about 40,000) and Tanzania (20,000–30,000) have the most hippos. They are threatened because they are losing their habitats and being poached for their meat and ivory teeth.