Despite its stocky shape and short legs, it can easily outrun a human. Hippos have been clocked at 48 km/h while running short distances, faster than an Olympic sprinter. The hippopotamus is regarded to be Africa's most dangerous animal, and is among the most aggressive animals in the world. There are an estimated 125,000 to 150,000 hippos remaining throughout Sub-Saharan Africa, of which Zambia (40,000) and Tanzania (20,000-30,000) have the largest populations. They are still threatened by poaching for their meat and ivory canine teeth, and by habitat loss.