Schaller and Lowther kept on walking, but this time, instead of viewing the vast herds of zebra, wildebeest, and gazelle as meat on the hoof that one must personally subdue, they imagined it as a movable feast, on the crumbs of which a band of small, unarmed early hominids might feed opportunistically—not by hunting but by gathering. They made some illuminating discoveries. It happened to be calving season so, first, they concentrated on calves and fawns. In the space of two hours, they spotted eighty pounds’ worth of meat in the form of easily caught young animals and abandoned carcasses. The
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