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Water is one of the most powerful forces on the planet. It has the power to shape our world - carving out huge canyons, and bringing life to parched deserts. The animals which live in, on, and over the Earth's rivers are some of nature's most specialized killers. From the shooting ability of the Archer Fish, to the speed and size of the Giant Otter, see how some amazing predators are equipped for the intensity of life in and around the vigorous currents of the world's waterways.