The cheetah may be the fastest animal around, but its speed comes with a price; if it runs for too long and gets too hot, its heart and brain will cook. Watch the Full Episode with your FREE trial for ...

In the scorching Namib Desert, the dunes are filled with predators and the only way to survive this is with speed and deadliness. Follow desert hunters like shovel-snouted lizards, sidewinders, even a ...