Deep in southern Africa, a mighty river snakes through untamed wilderness. Its vast flood plains are a magnet for wildlife. In the dry season animals travel great distances to reach this oasis and during droughts space and resources are at a premium. But every animal has its place along the banks of the mighty Chobe river. The river winds through the parched landscape of northern Botswana. Flooded by distant rains during the dry season, it's the only water for miles around.