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Get ready to go hand to scale and face to fang with some of the world's deadliest cold-blooded killers. Nat Geo WILD seeks out the slithering creatures that could make even the toughest person's skin crawl. And meet the experts determined to get close to these dangerous serpents, all in the name of science. Track down the Australian copperhead: This supersnake isn't just deadly, it's a cannibal that will destroy any prey that crosses its path - even its own kind.