The more than 400 footprints cover an area slightly larger than a tennis court, crisscrossing the dark gray mudflat of Engare Sero, on the southern shore of Tanzania’s Lake Natron. No other site in Africa has as many ancient
Homo sapiens footprints—making it a treasure trove for scientists trying to tell the story of humankind’s earliest days.
Some of the tracks seem to show people jogging through the muck, keeping upwards of a 12-minute-mile pace. Other prints imply a person with a slightly strange, possibly broken big toe.
Yet more tracks suggest that around a dozen people, mostly women and children, traveled across the mudflat together, striking toward the southwest for parts unknown. The mud tracked it all—including the dirty droplets that fell from their feet with each step.