Despite its calm appearance, it is best not to rub against a hippo. Even crocodiles are wary of this 3-ton mastodon with impressive canines. This semi-aquatic animal lives along the rivers of Africa and spends its days immersed in water to fight against the heat. It is only after dark that he reaches the mainland to eat fresh grass (up to 40 kg per day). The hippopotamus is easily recognizable! It has a massive silhouette, small ears, short legs and a huge mouth with impressive teeth. The hippos live in groups of about fifteen individuals respecting a strict hierarchy.