Hippos watch strictly over their territories and threaten anybody invading it by what looks like yawning. If the invader does not withdraw, they usually attack without any further hesitation. Smaller boats are particularly at risk, because a hippo can easily topple it over, and as their front teeth are as sharp as razorblades, chances of survival are slim.
Game reserves: Hippos are numerous in the St. Lucia Wetlands Park (Natal), in the Kruger Park, in the Caprivi reserves and in the Chobe Park (Botswana).
Hippos are the most feared animals in southern Africa. Each year more people are killed by them than by all the other animals together.
Hippos weigh up to two tons and can be four metres long. Hippos are vegetarians and feed exclusively on grass.