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From the remote swamps of eastern India, reports are coming in of villages full of widows -- their husbands killed by a creature that attacks unseen and unprovoked. The culprit is one of nature's most revered animals: the Bengal tiger. Normally, tigers shy away from people, but in this region thousands of innocent locals have died at the jaws of these cats, and it's only getting worse -- but why? Nat Geo joins adventurer Richard Terry as he investigates this pattern of strange animal behavior.