TIME Magazine: Keeping Track of a Dying Art
The science of tracking--following the paths of animals in the wild--has been practiced since hunter-gatherers first appeared on the African savanna some 100,000 years ago. Interpreting nature's vocabulary of footprints and foliage, Stone Age hunters not only pursued their prey but also acquired a practical understanding of recurring patterns in animal behavior. But the tracker's knowledge was never written down. Even today, among the few remaining hunter-gatherer communities in Africa, Asia and Australia, the best trackers can neither read nor write. Instead, their skills are passed down through the generations by oral tradition. But as these dwindling, isolated communities face increasing social marginalization, their tribal cultures and means of survival are under threat. Now, a South African scientist is using advanced computer technology to revive the dying art of tracking.

In 2003, trained trackers combing the rich jungles in the Republic of Congo's Lossi Sanctuary for gorillas and chimpanzees stumbled upon a disturbing trend. Duikers, dog-sized antelopes that weave and dive through the jungle's dense undergrowth, were dying at an astounding rate—local indices dropped 50 percent compared to a 2000 census. Gorillas and chimpanzees were dying at similar rates. Blood tests confirmed the culprit was the deadly virus Ebola. The surprise was that no one had previously known that Ebola killed antelopes.
During his first full-throttle "persistence hunt," the South African biologist Louis Liebenberg was working with bushmen in the Kalahari Desert in the early 1990s. Armed with handmade bows and arrows, the hunters had been stalking kudu—a nimble antelope, slightly smaller than an elk. When a young stag split off from the herd, the bushmen ran flat-out after it.
NORDHOEK, South Africa -- Sitting at his laptop computer, Louis Liebenberg compares two maps of the same area: While the first is plotted thickly with yellow dots, the yellow areas on the second map are far sparser.