A shark that walks in water instead of swimming might sound like a creature straight out of a science fiction thriller. However, that is precisely how the four new species of the fish — found in the tropical waters of the Indo-Australian archipelago — move across the seafloor. The unique ocean dwellers were discovered by a team of scientists, led by Dr. Christine Dudgeon from Australia's University of Queensland, during a 12-year global conservation study.<br><br>The newly-found species belong to the genus Hemiscyllium, the same family as the previously known five species. The sharks have all evolved to survive in low oxygen environments, enabling them to hunt during low tides. The researchers believe their ability to use their fins to walk across the water affords the sharks a substantial advantage over the unsuspecting smaller animals they prey on. Though they are an apex predator in their shallow coral reef habitat, the tiny sharks are harmless to humans.
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