Africa is a land of giants. Its mighty rivers sculpt the earth and form impressive valleys and waterways home to many imposing and powerful inhabitants. These are the rivers where massive elephants and hippos live, feed and drink and where ancient crocodiles hunt and breed. They share the rivers with other creatures of their kind, such as porcupines - the giant rodents in Africa, the martial eagle - the biggest of its kind on the continent, and the leopard - a giant among the spotted cats