With fur designed to keep you warm, keeping cool is never going to be easy, yet mammals are found in the hottest, driest places on earth such as Australia's barren outback, where they have found remarkable ways to stays cool, find water, and beat the heat.

From down in the undergrowth to high above the treetops, we see how mammals have conquered every level of the forest with perfect camouflage, secret messages, and even the power of flight, but now many face new challenges as they are forced to adapt to a changing world.