BRIAN BENZA PRELIMINARY tests to explain the reason for hundreds of mysterious elephant deaths in Botswana point to a naturally occurring toxin as a probable cause, a senior wildlife official told Reuters. It was highly unlikely that an infectious disease was behind the shocking deaths of at least 281 elephants, added Cyril Taolo, acting director of the Department of Wildlife and National Parks. Officials had been struggling to establish the cause of death more than two months after the first carcasses were spotted in the Okavango Panhandle region. Initial investigations appeared to rule out common causes like poaching and anthrax.…