In this video from Nature, cinematographer Martyn Colbeck follows elephants as they cross the desert to find an isolated waterhole. The elephants must travel over 70 kilometers from one source of water to get to a riverbed that has more water for them to drink. Colbeck notes that the elephants show amazing brain power in remembering where each riverbed is and exactly how to get there . For more on elephants see "Grassland Elephants" and "Forest Elephants", two of three video segments in the series.