For a river that conjures up images of pyramids and pharaohs, the Nile turns out to be a truly surprising river that changes at every twist and turn of its journey. As its flows into increasingly arid latitudes on its journey north it becomes an evermore vital lifeline for animals and people, but only if they can conquer the challenges that this ever-changing river throws at them. The Nile's story begins in a spectacular, tropical mountain range - the Rwenzoris. Streams plunge from these snowy peaks creating wetlands on the plains below. Here they create a mobile water garden of papyrus reeds, home to one of the world's strangest birds- a shoebill stork. Though beautiful, clumps of reeds break up and float around creating a challenging environment for would-be fishermen.