Arid and unforgiving, deserts push their inhabitants to the extreme. From the desert elephant to the shovel-snouted lizard, see how they survive.

Rivers are the lifeblood Africa's arid landscapes. But while they offer sustenance, the kings of the water take no prisoners here.

Africa's rainforests are second only to the Amazon in size. See these tangled worlds, home to chimpanzees, gorillas and forest elephants.