Deserts are united by their lack of rain, yet they are the most varied of our planet's ecosystems. Go where freshwater is really precious and meet animals that have learned to survive with small amounts of it, such as the wild Bactrian camel of Mongolia's Gobi Desert that eats snow instead of drinking water or Chile's guanacos that lick dew from cactus spines. Experience spectacular aerial and time-lapse footage, featuring an explosion of life and shifting sand dunes.