It's not long after dark on a starry night, and three SUVs are bumping along a dirt track in a remote corner of southern Zambia. Inside the vehicles is a troop of more than a dozen men, most dressed in green overalls that bear more than a passing resemblance to army fatigues. Their mission is mundane, even boring: they will spend the entire night sitting still - up to 12 straight hours punctuated only by the odd insect bite. They say that the boredom really begins to kick in at around 02:00.
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