The herd was big; maybe 200 animals. It was evening now, and they were beginning to stir after bedding through the heat of the African day. The air so close to this many animals was pungent, reminiscent of an Oklahoma cattle sale barn. But this wasn't Oklahoma, and this herd only resembled cattle in a distant-cousin kind of way. These were cape buffalo, the most aggressive and dangerous of Africa's famed Big Five. And as the herd began moving our direction at 40 meters