Animals and peoples lived together for more then two million years, mammals like elephants, giraffes or hippos are still roaming forests and savannas. In the rain forest monkeys, chimpanzees, coloured birds, snakes and many exotic insects are living, some of them not yet discovered or described by biologists. In former times sparse human population enabled large animals and many rain forest species to survive. But the increasing population of southern Africa is endangering the wildlife. Much of the wildlife and wildlands have been lost. Industrial countries have made it profitable for Africans to cut down trees for timber, and plant forests in cash crops like cacao. African people are aware of this loss, national parks help to preserve some of the habitat of the wild animals.