Overview: On a cool July morning, in Tanzania's lush savannah, Bob Fontana shoulders his hunting rifle suddenly 2000 pounds of brute force bursts out of a nearby bush and tramples the man - its horns piercing the hunter's crumpled body. The culprit is legendary throughout Africa: The cape buffalo . But what has caused this normally placid grazer to attack a human? Chillingly, Fontana is not alone attacks by cape buffalo are occurring throughout the Dark Continent. But why?