Killer Bees and Magic Trees - S19.E12

Austrian scientist Gerald Kastberger studies the aggressive giant honeybees of Assam, in particular their unexplained annual migration from the Himalayan foothills to specific trees scattered across the plains a hundred miles to the south - a distance which takes the bees three weeks to cover. Feared locally as much as the tiger, the bees attack en masse, and a hundred or more stings can kill.